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.
Advisories

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Fixes

Solution

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Workaround

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History

Fri, 17 Apr 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Firebirdsql
Firebirdsql firebird
Vendors & Products Firebirdsql
Firebirdsql firebird

Fri, 17 Apr 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 17 Apr 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title Firebird has a buffer overflow when parsing corrupted slice packets
Weaknesses CWE-120
CWE-502
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-17T19:21:17.132Z

Reserved: 2026-03-18T22:15:11.812Z

Link: CVE-2026-33337

cve-icon Vulnrichment

Updated: 2026-04-17T19:21:13.730Z

cve-icon NVD

Status : Received

Published: 2026-04-17T19:16:36.223

Modified: 2026-04-17T19:16:36.223

Link: CVE-2026-33337

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-17T20:30:15Z

Weaknesses