Firebird has a buffer overflow when parsing corrupted slice packets

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Summary

CVECVE-2026-33337
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-17 19:16:36 UTC
Updated2026-04-17 19:16:36 UTC
DescriptionFirebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-120 | CWE-502 | CWE-120 CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') | CWE-502 CWE-502: Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FirebirdSQL Firebird affected >= 3.0.0, < 3.0.14 Not specified
CNA FirebirdSQL Firebird affected >= 4.0.0, < 4.0.7 Not specified
CNA FirebirdSQL Firebird affected >= 5.0.0, < 5.0.4 Not specified

References

ReferenceSourceLinkTags
github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p [email protected] github.com
github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 [email protected] github.com
github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 [email protected] github.com
github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 [email protected] github.com
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