NULL pointer dereference in MapServer - #VU147315
Published: September 7, 2026
Vulnerability identifier: #VU147315
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-476
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 a null pointer dereference in msWriteErrorImage() when rendering an in-image WMS exception after oversized image allocation fails. A remote attacker can submit a WMS GetMap request with oversized WIDTH and HEIGHT values that triggers an in-image exception to cause a denial of service.
Affected software
MapServer
Remediation
Install security update from vendor's website.
MapServer - update to 8.6.6