Main Vulnerability Database Vulnerabilities #VU146016

Uncontrolled Recursion in MapServer - #VU146016

Published: August 27, 2026

Vulnerability identifier: #VU146016

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: N/A

CWE-ID: CWE-674

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled recursion in the WMS GetMap FILTER parser and processing path when handling a crafted FILTER parameter containing an element with many sibling clauses. A remote attacker can send a specially crafted GetMap request to cause a denial of service.

The issue is triggered before any map image is produced and does not depend on valid data or matching records, but it requires a WMS layer that accepts a FILTER parameter.

Affected software

MapServer

Remediation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

External References

https://github.com/MapServer/MapServer/security/advisories/GHSA-5fx4-vjp9-863f

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