CVE-2026-28214

MEDIUM

Firebird server hangs when using specific clumplet on batch creation

Title source: cna

Description

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the ClumpletReader::getClumpletSize() function can overflow the totalLength value when parsing a Wide type clumplet, causing an infinite loop. An authenticated user with INSERT privileges on any table can exploit this via a crafted Batch Parameter Block to cause a denial of service against the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

References (4)

[X_Refsource_Confirm] https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7cq5-994r-jhrf

[X_Refsource_Misc] https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14

[X_Refsource_Misc] https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7

[X_Refsource_Misc] https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4

Scores

CVSS v3 6.5

EPSS 0.0006

EPSS Percentile 19.2%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-190 CWE-835

Status published

Products (4)

firebirdsql/firebird < 3.0.14

FirebirdSQL/firebird >= 3.0.0, < 3.0.14

FirebirdSQL/firebird >= 4.0.0, < 4.0.7

FirebirdSQL/firebird >= 5.0.0, < 5.0.4

Published Apr 17, 2026

Tracked Since Apr 18, 2026