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Information leak vulnerability in firebird3 client when used with newer (>= 4) server

High
dyemanov published GHSA-mfpr-9886-xjhg Apr 17, 2026

Package

firebird client

Affected versions

<= 3.0.13

Patched versions

client 4.0.0 or higher, client 3.0.14 (when released)

Description

Information leak vulnerability

Package: FB3 client + FB4 or higher server
Affected versions: FB3 client
Patched versions: FB4 client or higher

Description

Impact

FB3 client library placed wrong data length into XSQLDA fields when used with FB4 or higher server

Patches

Upgrade client to one from fb4 or even better fb5

Credits

Thanks to Aleksey Solovev (Positive Technologies)

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:L

CVE ID

CVE-2025-65104

Weaknesses

No CWEs