CVE-2026-28214
MEDIUMFirebird server hangs when using specific clumplet on batch creation
Title source: cnaDescription
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)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7cq5-994r-jhrf
X_Refsource_Misc x_refsource_misc
https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14
X_Refsource_Misc x_refsource_misc
https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7
X_Refsource_Misc x_refsource_misc
https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4
Scores
CVSS v3
6.5
EPSS
0.0113
EPSS Percentile
62.1%
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