High severity7.5NVD Advisory· Published Apr 17, 2026· Updated Apr 27, 2026
CVE-2026-33337
CVE-2026-33337
Description
Firebird 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.
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Affected products
2cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:*range: >=3.0.0,<3.0.14
- (no CPE)range: prior to 5.0.4, 4.0.7, 3.0.14
Patches
Vulnerability mechanics
References
4- github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47pnvdExploitVendor Advisory
- github.com/FirebirdSQL/firebird/releases/tag/v3.0.14nvdRelease Notes
- github.com/FirebirdSQL/firebird/releases/tag/v4.0.7nvdRelease Notes
- github.com/FirebirdSQL/firebird/releases/tag/v5.0.4nvdRelease Notes
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