CVE-2026-33337

Summary

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.

Affected Software

VendorProductVersion RangeStatus
FirebirdSQLfirebird>= 3.0.0, < 3.0.14affected
FirebirdSQLfirebird>= 4.0.0, < 4.0.7affected
FirebirdSQLfirebird>= 5.0.0, < 5.0.4affected

Weaknesses

  • CWE-120: CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
  • CWE-502: CWE-502: Deserialization of Untrusted Data

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: yes
    • Technical Impact: partial

References