SB2026051195 - NULL pointer dereference in MapServer

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Main Vulnerability Database SB2026051195

SB2026051195 - NULL pointer dereference in MapServer

Published: May 11, 2026

Security Bulletin ID SB2026051195
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) NULL pointer dereference (CVE-ID: CVE-2026-45104)

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

The vulnerability exists due to a null pointer dereference in msSLDParseUserStyle and _SLDApplyRuleValues in MapServer SLD support when processing a crafted SLD ElseFilter rule through the WMS SLD_BODY parameter. A remote attacker can send a specially crafted SLD payload to cause a denial of service.

The issue is reachable through the WMS handler without authentication, and long-lived deployments such as FastCGI, mod_mapserver, or MapScript bindings may terminate the serving process for unrelated in-flight requests.


Remediation

Install update from vendor's website.

References