PT-2026-44078 · Mapserver · Mapserver

Marklee131 · Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-45104

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions MapServer versions 6.4.0 through 8.6.2

Description A NULL pointer dereference occurs when the msSLDParseUserStyle function calls SLDApplyRuleValues(psRule, psLayer, 1) for any <Rule> containing an <ElseFilter/>. The system assumes msSLDParseRule added one class; however, if the rule lacks a symbolizer, msSLDParseRule adds zero classes, leading the system to index class[-1]. This can be triggered without authentication using a well-formed 200-byte SLD via the 'SLD BODY=' parameter in the WMS endpoint.

Recommendations Update to version 8.6.3.

Fix

Improper Validation of Array Index

NULL Pointer Dereference

Weakness Enumeration

CWE-129

CWE-476

Related Identifiers

CVE-2026-45104

Affected Products

Mapserver

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-45104 · Security Note
• https://github.com/MapServer/MapServer/security/advisories/GHSA-4h8g-378q-r75m · Note
• https://twitter.com/CVEnew/status/2059718098668888175 · Twitter Post