Uncontrolled Recursion in MapServer - #VU147313
Published: September 7, 2026
Vulnerability identifier: #VU147313
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 processing path when handling a crafted WMS GetMap request containing a logical filter with many sibling clauses. A remote attacker can send a specially crafted WMS GetMap request to cause a denial of service.
The crash occurs before map image rendering and does not depend on dataset contents.
Affected software
MapServer
Remediation
Install security update from vendor's website.
MapServer - update to 8.6.6