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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact Low

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
FirebirdSQL firebird affected
Version Status Constraints
>= 3.0.0, < 3.0.14 affected —
>= 4.0.0, < 4.0.7 affected —
>= 5.0.0, < 5.0.4 affected —

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 cve-icon cve-icon
https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 cve-icon cve-icon
https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 cve-icon cve-icon
https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7cq5-994r-jhrf cve-icon cve-icon
History

Fri, 17 Apr 2026 21:15:00 +0000

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

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, 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.
Title Firebird server hangs when using specific clumplet on batch creation
Weaknesses CWE-190
CWE-835
References
Metrics cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-17T18:35:46.974Z

Reserved: 2026-02-25T15:28:40.649Z

Link: CVE-2026-28214

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-17T19:16:35.327

Modified: 2026-04-17T19:16:35.327

Link: CVE-2026-28214

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-17T21:00:12Z

Weaknesses