Vulnerability Details CVE-2026-33337
Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 16.8%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-33337
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cpe:2.3:a:firebirdsql:firebird:3.0.0
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cpe:2.3:a:firebirdsql:firebird:3.0.1
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cpe:2.3:a:firebirdsql:firebird:3.0.10
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cpe:2.3:a:firebirdsql:firebird:3.0.11
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cpe:2.3:a:firebirdsql:firebird:3.0.12
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cpe:2.3:a:firebirdsql:firebird:3.0.13
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cpe:2.3:a:firebirdsql:firebird:3.0.2
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cpe:2.3:a:firebirdsql:firebird:3.0.3
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cpe:2.3:a:firebirdsql:firebird:3.0.4
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cpe:2.3:a:firebirdsql:firebird:3.0.5
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cpe:2.3:a:firebirdsql:firebird:3.0.6
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cpe:2.3:a:firebirdsql:firebird:3.0.7
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cpe:2.3:a:firebirdsql:firebird:3.0.8
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cpe:2.3:a:firebirdsql:firebird:3.0.9
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cpe:2.3:a:firebirdsql:firebird:4.0.0
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cpe:2.3:a:firebirdsql:firebird:4.0.1
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cpe:2.3:a:firebirdsql:firebird:4.0.2
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cpe:2.3:a:firebirdsql:firebird:4.0.3
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cpe:2.3:a:firebirdsql:firebird:4.0.4
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cpe:2.3:a:firebirdsql:firebird:4.0.5
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cpe:2.3:a:firebirdsql:firebird:4.0.6
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cpe:2.3:a:firebirdsql:firebird:5.0.0
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cpe:2.3:a:firebirdsql:firebird:5.0.1
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cpe:2.3:a:firebirdsql:firebird:5.0.2
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cpe:2.3:a:firebirdsql:firebird:5.0.3