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CVE-2026-27890

Firebird has Pre-Auth DOS when Processing Out of Order CNCT_specific_data Segments PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
FirebirdSQL / firebirdaffected >= 3.0.0, < 3.0.14; affected >= 4.0.0, < 4.0.7; affected >= 5.0.0, < 5.0.4

CWE

CWE-119, CWE-787

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.