notify: fix panic when truncating multi-byte messages by MaxFreedomPollard · Pull Request #5544 · prometheus/alertmanager

MaxFreedomPollard · 2026-09-06T02:53:29Z

TruncateInBytes in notify/util.go indexes the rune slice with a byte count. On main, line 139 builds the starting slice as r[:truncationTarget], where r is []rune(s) and truncationTarget is n-3, a number of bytes. A string holding multi-byte characters has fewer runes than bytes, so whenever the input is longer than n bytes while holding fewer than n-3 runes, the index runs past the end of the rune slice and panics.

The Webex notifier is the only caller in this repository. notify/webex/webex.go:89 truncates the rendered markdown to maxMessageSize, which is 7439 bytes, so a notification whose message reaches 7440 bytes of non-ASCII text crashes Alertmanager. 3720 Cyrillic characters, 2480 CJK characters or 1860 emoji are enough. The notification pipeline runs in a goroutine started by the dispatcher at dispatch/dispatch.go:578, and neither notify nor dispatch recovers, so the process exits.

panic: runtime error: slice bounds out of range [:7436] with capacity 4096

github.com/prometheus/alertmanager/notify.TruncateInBytes(...)
	notify/util.go:139
github.com/prometheus/alertmanager/notify/webex.(*Notifier).Notify(...)
	notify/webex/webex.go:89

The line arrived in f51f51e, "Use the new truncation in bytes functions to ensure strings are not butchered", part of #3132, which replaced the byte slicing that #3135 had introduced a day earlier. TruncateInRunes is not affected: it returns early when len(r) <= n, so its own r[:n-1] is always in range.

What changed

truncatedRunes now starts at r[:min(truncationTarget, len(r))]. The loop that follows already trims the slice down until it fits, and truncationTarget is still the byte budget it trims to, so the returned string is unchanged for every input that did not panic. The existing TestTruncate table passes untouched.

How tested

Two new tests fail on unmodified main and pass with the fix.

TestTruncateInBytesFewerRunesThanBytes in notify/util_test.go covers two-byte, three-byte and four-byte runes at the Webex limit. It asserts the result stays within the limit, ends with the truncation marker, is a prefix of the input, and keeps as many whole runes as the byte budget allows.

TestWebexTruncatesMultiByteMessage in notify/webex/webex_test.go drives Notify end to end with a 3720 character Cyrillic annotation against an httptest server, and asserts the posted markdown fits maxMessageSize.

On unmodified main, with only the two test files applied:

--- FAIL: TestTruncateInBytesFewerRunesThanBytes/two-byte_runes
panic: runtime error: slice bounds out of range [:7436] with capacity 4096
	notify/util.go:139
	notify/util_test.go:165
FAIL	github.com/prometheus/alertmanager/notify	0.415s

--- FAIL: TestWebexTruncatesMultiByteMessage
panic: runtime error: slice bounds out of range [:7436] with capacity 4096
	notify/util.go:139
	notify/webex/webex.go:89
	notify/webex/webex_test.go:205
FAIL	github.com/prometheus/alertmanager/notify/webex	0.365s

The third test change is one more case in the existing TestTruncate table, TruncateInBytes("😀😀", 7). Two runes, eight bytes: the byte budget left for the text is larger than the number of runes to pick it from. That case passes on main as well, because the rune slice happens to have enough spare capacity for the out of length index to be legal, and the loop then trims the zero runes it picked up back off. It is here to pin the small end of the same mistake.

With the fix applied, on Go 1.26.4 and golangci-lint v2.13.1, the version pinned in Makefile.common:

go test ./notify/ ./notify/webex/                  ok
go test -race -count=5 ./notify/ ./notify/webex/   ok
go test ./notify/...                               ok, all 20 packages
go vet ./notify/ ./notify/webex/                   clean
golangci-lint fmt ./notify/...                     no changes
golangci-lint run ./notify/ ./notify/webex/        0 issues
go build ./notify/...                              ok

I also ran go test across the 76 Go packages that build without the generated UI assets. They all pass except TestDefaultConfigFilesOthersWithXDGConfigHome in cli, which fails identically on unmodified main on macOS, because os.UserConfigDir returns ~/Library/Application Support there and ignores XDG_CONFIG_HOME. go build ./... needs ui/app/dist, which a fresh clone does not have, so I built and tested by package list instead.

Pull Request Checklist

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Which user-facing changes does this PR introduce?

[BUGFIX] notify: Fix a panic that crashed Alertmanager when a Webex notification was over the 7439 byte message limit while holding fewer runes than that, which is the case for any sufficiently long non-ASCII message.

TruncateInBytes indexed the rune slice with a byte count. In notify/util.go it built the starting slice as r[:truncationTarget], where r is []rune(s) and truncationTarget is n-3, a number of bytes. A string holding multi-byte characters has fewer runes than bytes, so whenever the input was longer than n bytes but held fewer than n-3 runes the index ran past the end of the rune slice and panicked with "slice bounds out of range". The Webex notifier is the only caller. It truncates the rendered message to maxMessageSize (7439 bytes) in notify/webex/webex.go:89, so a notification whose markdown was 7440 bytes or more of non-ASCII text crashed Alertmanager: 3720 Cyrillic characters, 2480 CJK characters or 1860 emoji are enough. The notification pipeline runs in a goroutine started by the dispatcher and nothing recovers, so the process exits. Clamp the starting index to the number of runes available. The loop that follows already trims the slice down until it fits the byte budget, so the result is unchanged for every input that did not panic. Add a case to TestTruncate covering a short string whose byte budget exceeds its rune count, TestTruncateInBytesFewerRunesThanBytes covering two-, three- and four-byte runes at the Webex limit, and TestWebexTruncatesMultiByteMessage covering the notifier end to end. Signed-off-by: Max Freedom Pollard <[email protected]>

coderabbitai · 2026-09-06T02:56:08Z

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notify/webex/webex_test.go

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Walkthrough

TruncateInBytes now bounds its initial rune slice by the available runes. ParseRetryAfter parses integer-second and HTTP-date values, uses a valid response Date header for time alignment, and returns zero for missing or invalid values. Tests cover multibyte truncation and Webex payload limits.

Changes: Notification utility fixes

Layer / File(s)	Summary
Safe rune-bound truncation `notify/util.go`, `notify/util_test.go`, `notify/webex/webex_test.go`	`TruncateInBytes` limits its initial rune slice to the available runes. Tests cover multibyte inputs and verify that Webex payloads stay within the byte limit.
Retry-After parsing `notify/util.go`	`ParseRetryAfter` parses integer-second and HTTP-date values. It uses a valid response `Date` header for time alignment and returns zero for missing or invalid values.

Priority: Not assessed

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: Low · up to dbbd3

The change is mergeable with awareness that unusually large Retry-After values may produce an incorrect retry delay; that issue remains open.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly identifies the notify area and the primary bugfix: preventing a panic when truncating multi-byte messages. It is concise and follows the repository's required "area: short descriptio…
Description check		The description is complete and relevant. It explains the root cause, implementation, tests, validation results, checklist items, and user-facing release note. It also documents the known unrelated ma…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Explanation

The title clearly identifies the notify area and the primary bugfix: preventing a panic when truncating multi-byte messages. It is concise and follows the repository's required "area: short description" format.

Full details: Description check

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The description is complete and relevant. It explains the root cause, implementation, tests, validation results, checklist items, and user-facing release note. It also documents the known unrelated macOS test failure and the generated UI asset limitation.

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TheMeier · 2026-09-18T11:23:18Z

/workflow-approve

Signed-off-by: Max Freedom Pollard <[email protected]>

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Actionable comments posted: 1

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⚠️ Outside diff range comments (1)

🟡 Minor · Reject unrepresentable retry delays. · util.go:257

notify/util.go:257
🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Reject unrepresentable retry delays.

On 64-bit systems, strconv.Atoi accepts values such as Retry-After: 18446744074. The time.Duration(secs) * time.Second conversion overflows before max(0, ...) runs. The wrapped value remains positive, so Slack and Webex can wait for a much shorter delay than requested.

Check the maximum representable seconds before multiplication. Return zero when secs exceeds that limit.
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In `@notify/util.go` at line 257, Update the retry-delay conversion in the
surrounding parser to check whether secs exceeds the maximum representable
time.Duration value in seconds before multiplying by time.Second; return zero
for unrepresentable values, while preserving the existing nonnegative handling
for valid delays.

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Inline comments:
In `@notify/webex/webex_test.go`:
- Line 316: Update the test handler around io.ReadAll and the Notify call so the
handler sends its read error through a channel instead of calling
require.NoError directly in the server goroutine; after Notify returns, receive
that error and assert it in the test goroutine.

---

Outside diff comments:
In `@notify/util.go`:
- Line 257: Update the retry-delay conversion in the surrounding parser to check
whether secs exceeds the maximum representable time.Duration value in seconds
before multiplying by time.Second; return zero for unrepresentable values, while
preserving the existing nonnegative handling for valid delays.

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Signed-off-by: Max Freedom Pollard <[email protected]>

SoloJacobs

LGTM. Some minor improvements.

Signed-off-by: Max Freedom Pollard <[email protected]>

SoloJacobs · 2026-09-30T07:14:54Z

LGTM, thanks!

Signed-off-by: Max Freedom Pollard <[email protected]>

main changed Notify to return a NotifyVerdict, moved the Webex config into the webex package and dropped the types.Alert alias, so the test no longer compiled against main. Signed-off-by: Max Freedom Pollard <[email protected]>

Signed-off-by: Max Freedom Pollard <[email protected]>

MaxFreedomPollard · 2026-10-27T21:52:47Z

Thanks. The two comment trims went in with dc7db45. The Test job failed because main had moved on (NotifyVerdict, the Webex config moving into the webex package, and the types.Alert alias removal), so my new Webex test no longer compiled against main. I merged main, updated the test to the current API, and dropped the matching history sentence from the Webex test comment. I could not run the suite locally on this revision, so could someone approve the workflow run?

SoloJacobs · 2026-10-28T09:56:30Z

Nice, thank 👍

….2 ➔ v0.35.0) (#1670) This PR contains the following updates: | Package | Update | Change | |---|---|---| | [quay.io/prometheus/alertmanager](https://github.com/prometheus/alertmanager) | minor | `v0.34.2` → `v0.35.0` | --- ### Release Notes <details> <summary>prometheus/alertmanager (quay.io/prometheus/alertmanager)</summary> ### [`v0.35.0`](https://github.com/prometheus/alertmanager/releases/tag/v0.35.0): 0.35.0 / 2026-11-09 [Compare Source](prometheus/alertmanager@v0.34.2...v0.35.0) - \[CHANGE] Promote the `auto-gomemlimit` feature flag to the `--auto-gomemlimit` command-line flag. This is a breaking change: the `--enable-feature=auto-gomemlimit` option has been removed. [#5464](prometheus/alertmanager#5464) - \[CHANGE] Remove the deprecated `types` package in favor of the `alert` package. [#5585](prometheus/alertmanager#5585) - \[CHANGE] eventrecorder: Every output now requires a `name`. This is a breaking change: configurations with unnamed outputs fail to load. The name identifies the output in metrics and logs instead of its URL, broker or topic. [#5393](prometheus/alertmanager#5393) - \[CHANGE] eventrecorder: The output data format now uses the new `events/v2` schema. This is a breaking change: alert labels, alert annotations, group labels, silence annotations, and muted-alert labels are JSON maps, and protobuf consumers must use the new schema. [#5409](prometheus/alertmanager#5409), [#5500](prometheus/alertmanager#5500) - \[FEATURE] Add a distroless container image. [#5258](prometheus/alertmanager#5258) - \[FEATURE] amtool: Look up the default config file in `%APPDATA%` and `%ProgramData%` on Windows. [#5073](prometheus/alertmanager#5073) - \[FEATURE] api: Add an experimental ConnectRPC API served alongside `/api/v2/` under the version-neutral `/api/` prefix, exposing the Connect, gRPC, and gRPC-Web protocols plus the gRPC Health Checking Protocol and server reflection. The first service is `status.v3.StatusService`. [#5377](prometheus/alertmanager#5377), [#5506](prometheus/alertmanager#5506), [#5507](prometheus/alertmanager#5507), [#5508](prometheus/alertmanager#5508), [#5509](prometheus/alertmanager#5509) - \[FEATURE] incidentio: Add templated `metadata` field. [#5022](prometheus/alertmanager#5022) - \[FEATURE] pagerduty: Report more specific failure reasons in `alertmanager_notifications_failed_total`. [#5659](prometheus/alertmanager#5659) - \[FEATURE] rocketchat: Add `message_text` option to set the message text shown in desktop and push notifications. [#5595](prometheus/alertmanager#5595) - \[FEATURE] slack: Add `post_updates_to_thread` option to post subsequent notifications of an alert group as replies in the thread of the initial message. [#5540](prometheus/alertmanager#5540) - \[FEATURE] telegram: Add `timeout` option to limit how long a notification request may take. [#5127](prometheus/alertmanager#5127) - \[FEATURE] telegram: Count only visible HTML text toward the message length limit, excluding link URLs. [#5499](prometheus/alertmanager#5499) - \[FEATURE] template: Add `addDuration` function to shift a timestamp by a duration such as `-30m` and return it in Unix milliseconds. [#5550](prometheus/alertmanager#5550) - \[FEATURE] template: Allow the `join` function to accept slices and arrays of any type. [#5233](prometheus/alertmanager#5233) - \[FEATURE] timeinterval: Allow weekday ranges to wrap around the end of the week, e.g. `friday:monday`. [#5579](prometheus/alertmanager#5579) - \[FEATURE] ui: Make the creator and comment of a silence optional, matching the API. [#5471](prometheus/alertmanager#5471) - \[FEATURE] ui: Serve the new Mantine UI at `/ui/` alongside the existing UI. [#5502](prometheus/alertmanager#5502), [#5538](prometheus/alertmanager#5538), [#5539](prometheus/alertmanager#5539), [#5537](prometheus/alertmanager#5537) - \[ENHANCEMENT] Compute alert fingerprints once at ingestion instead of on every mute check, reducing CPU usage and allocations. [#5583](prometheus/alertmanager#5583) - \[ENHANCEMENT] api: Speed up `/api/v2/alerts/groups` by evaluating mutes only once per alert and group. [#5674](prometheus/alertmanager#5674) - \[ENHANCEMENT] cluster: Fix the `memeberlist` typo in error messages. [#5472](prometheus/alertmanager#5472) - \[ENHANCEMENT] docs: Add a Gotify example using a custom webhook payload. [#5408](prometheus/alertmanager#5408), [#5498](prometheus/alertmanager#5498) - \[ENHANCEMENT] docs: Add a reusable HTML email template example. [#5391](prometheus/alertmanager#5391) - \[ENHANCEMENT] docs: Clarify the usage of the KV `Remove` template function. [#5297](prometheus/alertmanager#5297) - \[ENHANCEMENT] docs: Clarify which route options are inherited by child routes. [#5565](prometheus/alertmanager#5565) - \[ENHANCEMENT] docs: Correct the PagerDuty default config. [#5397](prometheus/alertmanager#5397) - \[ENHANCEMENT] docs: Document OAuth2 support in the `http_config` of `jira_config`. [#5571](prometheus/alertmanager#5571) - \[ENHANCEMENT] docs: Document VictorOps custom fields. [#5399](prometheus/alertmanager#5399) - \[ENHANCEMENT] docs: Document `project` and `issue_type` in `jira_config` as templated strings. [#5549](prometheus/alertmanager#5549) - \[ENHANCEMENT] docs: Document `victorops_api_key` and `victorops_api_key_file` in the global config. [#5168](prometheus/alertmanager#5168) - \[ENHANCEMENT] docs: Fix `rocketchat_config` defaults and field types. [#5591](prometheus/alertmanager#5591) - \[ENHANCEMENT] docs: Fix the `tracing` config key, which was misspelled as `traciing`. [#5437](prometheus/alertmanager#5437) - \[ENHANCEMENT] notify: Add the receiver name to the log message for failed notifications. [#5401](prometheus/alertmanager#5401) - \[ENHANCEMENT] silences: Reduce allocations when computing the `alertmanager_silences` metric. [#5460](prometheus/alertmanager#5460) - \[ENHANCEMENT] victorops: Use Splunk On-Call branding in documentation and error messages without renaming configuration fields. [#5402](prometheus/alertmanager#5402) - \[BUGFIX] api: Report alerts muted by time intervals as of the time of the request instead of the last group flush, matching silences and inhibitions. [#5661](prometheus/alertmanager#5661) - \[BUGFIX] cluster: Downgrade memberlist to v0.5.4 to fix `Failed to read remote state: user state length (...) exceeds limit` errors. [#5640](prometheus/alertmanager#5640) - \[BUGFIX] config: Fix merging of global configs for the smtp, opsgenie, victorops and rocketchat notifiers. [#5448](prometheus/alertmanager#5448), [#5457](prometheus/alertmanager#5457) - \[BUGFIX] discord: Retry notifications on HTTP 429 (rate limited) instead of dropping them. [#5496](prometheus/alertmanager#5496) - \[BUGFIX] httpserver: Fix the `/-/reload` endpoint getting stuck when the client cancels the request. [#5234](prometheus/alertmanager#5234) - \[BUGFIX] notify: Wait the full backoff interval before retrying a notification that failed slowly. [#5497](prometheus/alertmanager#5497), [#5389](prometheus/alertmanager#5389), [#5553](prometheus/alertmanager#5553) - \[BUGFIX] opsgenie: Respect the notification timeout and tracing span for the update-message request sent when `update_alerts` is enabled. [#5465](prometheus/alertmanager#5465) - \[BUGFIX] pagerduty: Report the failure reason of Events API v1 requests in `alertmanager_notifications_failed_total` instead of `reason="other"`. [#5505](prometheus/alertmanager#5505) - \[BUGFIX] pushover: Trim whitespace from `token_file` and `user_key_file` contents so keys stored in files with a trailing newline are accepted. [#5590](prometheus/alertmanager#5590) - \[BUGFIX] silences: Treat a silence as expired at exactly its end time, consistent with the API. [#5665](prometheus/alertmanager#5665) - \[BUGFIX] silences: Use a single evaluation time for each read or write of silences. [#5666](prometheus/alertmanager#5666) - \[BUGFIX] slack: Avoid a panic when `update_message` relies on `global.slack_api_url`. [#5589](prometheus/alertmanager#5589) - \[BUGFIX] slack: Retry notifications on HTTP 429 (rate limited) and honor the `Retry-After` header instead of dropping them. [#5048](prometheus/alertmanager#5048) - \[BUGFIX] telegram: Redact the bot token from logged notification errors. [#5254](prometheus/alertmanager#5254) - \[BUGFIX] telegram: Report the failure reason in `alertmanager_notifications_failed_total`. [#5375](prometheus/alertmanager#5375) - \[BUGFIX] template: Preserve quoted numeric strings as strings in templated JSON fields. [#5098](prometheus/alertmanager#5098) - \[BUGFIX] timeinterval: Fix negative `days_of_month` resolving one day early in months with a DST transition. [#5447](prometheus/alertmanager#5447) - \[BUGFIX] timeinterval: Reject month numbers outside 1-12. [#5626](prometheus/alertmanager#5626) - \[BUGFIX] webex: Fix a panic when truncating long notifications containing non-ASCII characters. [#5544](prometheus/alertmanager#5544) - \[BUGFIX] webex: Retry notifications on HTTP 429 (rate limited) and honor the `Retry-After` header instead of dropping them. [#5548](prometheus/alertmanager#5548) - \[BUGFIX] wechat: Report template errors in `corp_id` and `api_secret` instead of sending a token request with empty values. [#5688](prometheus/alertmanager#5688) </details> --- ### Configuration 📅 **Schedule**: (in timezone Europe/Berlin) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about these updates again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.xcd.dev/gabrielcosi/home-ops/pulls/1670

MaxFreedomPollard requested a review from a team as a code owner September 6, 2026 02:53

TheMeier approved these changes Sep 18, 2026

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Merge branch 'main' into notify-truncate-multibyte-panic

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Comment thread notify/webex/webex_test.go Resolved

notify: assert Webex handler errors in the test goroutine

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Comment thread notify/util_test.go Resolved

Comment thread notify/util_test.go Resolved

notify: trim truncation test comments

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TheMeier requested a review from SoloJacobs October 16, 2026 09:53

soujasK mentioned this pull request Oct 26, 2026

Webex: fix panic when truncating long multi-byte messages grafana/alerting#729

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MaxFreedomPollard added 3 commits October 26, 2026 16:40

Merge branch 'main' into notify-truncate-multibyte-panic

e895e70

Signed-off-by: Max Freedom Pollard <[email protected]>

notify: drop crash history from Webex truncation test comment

dbbd36c

Signed-off-by: Max Freedom Pollard <[email protected]>

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SoloJacobs merged commit f0f37b9 into prometheus:main Oct 28, 2026
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coderabbitai Bot mentioned this pull request Oct 29, 2026

notify/matrix: add a Matrix receiver #5716

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Prepare release 0.35.0 #5735

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notify: fix panic when truncating multi-byte messages - #5544

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