Bug 2459246 (CVE-2026-27890) - CVE-2026-27890 Firebird: Firebird: Denial of Service via out-of-order authentication segments
Summary: CVE-2026-27890 Firebird: Firebird: Denial of Service via out-of-order authent...
Keywords:
Status: NEW
Alias: CVE-2026-27890
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2459255 2459257
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-17 19:01 UTC by OSIDB Bzimport
Modified: 2026-04-17 19:32 UTC (History)
0 users

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Description OSIDB Bzimport 2026-04-17 19:01:44 UTC 
Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when processing CNCT_specific_data segments during authentication, the server assumes segments arrive in strictly ascending order. If segments arrive out of order, the Array class's grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
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