Details

Impact

A vulnerability was discovered in go-git whereby data integrity values for .pack and .idx files were not properly verified. This resulted in go-git potentially consuming corrupted files, which would likely result in unexpected errors such as object not found.

For context, clients fetch packfiles from upstream Git servers. Those files contain a checksum of their contents, so that clients can perform integrity checks before consuming it. The pack indexes (.idx) are generated locally by go-git, or the git cli, when new .pack files are received and processed. The integrity checks for both files were not being verified correctly.

Note that the lack of verification of the packfile checksum has no impact on the trust relationship between the client and server, which is enforced based on the protocol being used (e.g. TLS in the case of https:// or known hosts for ssh://). In other words, the packfile checksum verification does not provide any security benefits when connecting to a malicious or compromised Git server.

Patches

Users should upgrade to v5.16.5, or the latest v6 pseudo-version, in order to mitigate this vulnerability.

Workarounds

In case updating to a fixed version of go-git is not possible, users can run git fsck from the git cli to check for data corruption on a given repository.

Credit

Thanks @​N0zoM1z0 for finding and reporting this issue privately to the go-git project.

Severity

• CVSS Score: 4.3 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

References

• https://github.com/go-git/go-git/security/advisories/GHSA-37cx-329c-33x3
• https://nvd.nist.gov/vuln/detail/CVE-2026-25934
• https://github.com/go-git/go-git
• https://github.com/go-git/go-git/releases/tag/v5.16.5

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

v5.16.5

Compare Source

What's Changed

• build: Update module golang.org/x/crypto to v0.45.0 [SECURITY] (releases/v5.x) by @​go-git-renovate[bot] in #​1744
• build: Bump Go test versions to 1.23-1.25 (v5) by @​pjbgf in #​1746
• [v5] git: worktree, Don't delete local untracked files when resetting worktree by @​Ch00k in #​1800
• Expand packfile checks by @​pjbgf in #​1836

Full Changelog: v5.16.4...v5.16.5

v5.16.4

Compare Source

What's Changed

• backport plumbing: format/idxfile, prevent panic by @​swills in #​1732
• [backport] build: test, Fix build on Windows. by @​pjbgf in #​1734
• build: Update module golang.org/x/net to v0.38.0 [SECURITY] (releases/v5.x) by @​go-git-renovate[bot] in #​1742
• build: Update module github.com/cloudflare/circl to v1.6.1 [SECURITY] (releases/v5.x) by @​go-git-renovate[bot] in #​1741
• build: Update module github.com/go-git/go-git/v5 to v5.13.0 [SECURITY] (releases/v5.x) by @​go-git-renovate[bot] in #​1743

Full Changelog: v5.16.3...v5.16.4

v5.16.3

Compare Source

What's Changed

• internal: Expand regex to fix build [5.x] by @​baloo in #​1644
• build: raise timeouts for windows CI tests and disable CIFuzz [5.x] by @​baloo in #​1646
• plumbing: support commits extra headers, support jujutsu signed commit [5.x] by @​baloo in #​1633

Full Changelog: v5.16.2...v5.16.3

v5.16.2

Compare Source

What's Changed

• utils: fix diff so subpaths work for sparse checkouts, fixes 1455 to releases/v5.x by @​kane8n in #​1567

Full Changelog: v5.16.1...v5.16.2

v5.16.1

Compare Source

What's Changed

• utils: merkletrie, Fix diff on sparse-checkout index. Fixes #​1406 to releases/v5.x by @​kane8n in #​1561

New Contributors

• @​kane8n made their first contribution in #​1561

Full Changelog: v5.16.0...v5.16.1

v5.16.0

Compare Source

What's Changed

• [v5] plumbing: support mTLS for HTTPS protocol by @​hiddeco in #​1510
• v5: plumbing: transport, Reintroduce SetHostKeyCallback. Fix #​1514 by @​pjbgf in #​1515

Full Changelog: v5.15.0...v5.16.0

v5.15.0

Compare Source

What's Changed

• plumbing: add cert auth support to releases/v5.x by @​Javier-varez in #​1482
• v5: Bump dependencies by @​pjbgf in #​1505

Full Changelog: v5.14.0...v5.15.0

v5.14.0

Compare Source

What's Changed

• v5: Bump Go and dependencies to mitigate GO-2025-3487 by @​pjbgf in #​1436

⚠️ Note that this version requires Go 1.23, due to the bump to golang.org/x/[email protected] which mitigates the CVE above. User's that can't bump to Go 1.23 will need to remain on the previous v5.13.x release.

Full Changelog: v5.13.2...v5.14.0

v5.13.2

Compare Source

What's Changed

• plumbing: use the correct user agent string. Fixes #​883 by @​uragirii in #​1364
• build: bump golang.org/x/sys from 0.28.0 to 0.29.0 in the golang-org group by @​dependabot in #​1365
• build: bump the golang-org group with 2 updates by @​dependabot in #​1367
• build: bump github.com/ProtonMail/go-crypto from 1.1.3 to 1.1.4 by @​dependabot in #​1368
• build: bump github.com/go-git/go-billy/v5 from 5.6.1 to 5.6.2 by @​dependabot in #​1378
• build: bump github/codeql-action from 3.28.0 to 3.28.1 by @​dependabot in #​1376
• build: bump github.com/elazarl/goproxy from 1.2.3 to 1.4.0 by @​dependabot in #​1377
• git: worktree, fix restoring dot slash files (backported to v5). Fixes #​1176 by @​BeChris in #​1361
• build: bump github.com/pjbgf/sha1cd from 0.3.0 to 0.3.2 by @​dependabot in #​1392
• git: worktree_status, fix adding dot slash files to working tree (backported to v5). Fixes #​1150 by @​BeChris in #​1359
• build: bump github.com/ProtonMail/go-crypto from 1.1.4 to 1.1.5 by @​dependabot in #​1383

Full Changelog: v5.13.1...v5.13.2

v5.13.1

Compare Source

What's Changed

• build: bump github.com/go-git/go-billy/v5 from 5.6.0 to 5.6.1 by @​dependabot in #​1327
• build: bump github.com/elazarl/goproxy from 1.2.1 to 1.2.2 by @​dependabot in #​1329
• build: bump github.com/elazarl/goproxy from 1.2.2 to 1.2.3 by @​dependabot in #​1340
• Revert "plumbing: transport/ssh, Add support for SSH @​cert-authority." by @​pjbgf in #​1346

Full Changelog: v5.13.0...v5.13.1