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CVE

CVE-2026-33337

Firebird has a buffer overflow when parsing corrupted slice packets
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CVE

CVE-2026-33337

Firebird has a buffer overflow when parsing corrupted slice packets

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14, https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7, https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33337.json, https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p, https://nvd.nist.gov/vuln/detail/CVE-2026-33337

Severity

7.5

CVSS Score
0
10

Basic Information

Base CVSS
7.5
EPSS Probability
0.00543%
EPSS Percentile
0.41833%
Introduced Version
af1546f15fa871b313ebcc7df1fd2df3c396c616,0
Fix Available
f6d83a28c009ab039ea40ffdb4ccc58f190dfbe6

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