# CVE-2026-33337

> Vulnerability · severity: **HIGH** (CVSS 7.5).

## 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.

## Key facts

- **CVE ID:** CVE-2026-33337
- **Published:** 2026-04-17
- **CVSS severity:** HIGH
- **CVSS base score:** 7.5
- **CWE codes:** CWE-120, CWE-502

## Affected products

- `firebirdsql:firebird`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33337

## Citation

> AI Analytics. CVE-2026-33337. Retrieved 2026-06-30 from https://api.ai-analytics.org/cve/CVE-2026-33337. Derived from NIST NVD. Licensed CC0.

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