Home/CVE/Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the Clum
CVE

CVE-2026-28214

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the Clum

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.

MEDIUM · CVSS 6.5 EPSS 0.00072
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-190Integer Overflow or Wraparound
CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
▤

Affected Products & Versions

3
firebirdsql firebird< 3.0.14
firebirdsql firebird>= 4.0.0 and < 4.0.7
firebirdsql firebird>= 5.0.0 and < 5.0.4
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-7cq5-994r-jhrfgithub.com
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD17 Apr 2026 · 07:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
suse-csafSUSE-SU-2026:1868-1
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14Release Notes
https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7Release Notes
https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4Release Notes
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