CVE-2026-33337CWE-120CWE-502

Firebird has a buffer overflow when parsing corrupted slice packets

High · published April 17, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
56.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00810 · 56.5th percentile
Weaknesses
CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'); CWE-502 · Deserialization of Untrusted Data
Published
2026-04-17T18:48Z
EPSS history
Timeline
  • 17 APR 18:48Z
    Firebird has a buffer overflow when parsing corrupted slice packets
    cvelistv5