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CVE-2026-33337

Firebird has a buffer overflow when parsing corrupted slice packets

High7.5EPSS 0.54%
Published
Updated
Reserved
Assigned by
GitHub_M

Description

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.

Scores

CVSS scores of CVE-2026-33337, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Analyzed3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.54% · top 54% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • FirebirdSQL · firebird

    • affected >= 3.0.0, < 3.0.14
    • affected >= 4.0.0, < 4.0.7
    • affected >= 5.0.0, < 5.0.4

References (4)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .