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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.

PUBLISHED Reserved 2026-02-25 | Published 2026-04-17 | Updated 2026-04-20 | Assigner GitHub_M




MEDIUM: 6.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

Problem types

CWE-190: Integer Overflow or Wraparound

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

Product status

>= 3.0.0, < 3.0.14
affected

>= 4.0.0, < 4.0.7
affected

>= 5.0.0, < 5.0.4
affected

References

github.com/...rebird/security/advisories/GHSA-7cq5-994r-jhrf

github.com/FirebirdSQL/firebird/releases/tag/v3.0.14

github.com/FirebirdSQL/firebird/releases/tag/v4.0.7

github.com/FirebirdSQL/firebird/releases/tag/v5.0.4

cve.org (CVE-2026-28214)

nvd.nist.gov (CVE-2026-28214)

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