CVEvulnerability

CVE-2026-45104

7.5 HIGH Published 2026-05-27 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-05-27
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-129, CWE-476

Description

MapServer is a system for developing web-based GIS applications. From 6.4.0 to before 8.6.3, msSLDParseUserStyle always calls _SLDApplyRuleValues(psRule, psLayer, 1); for any <Rule> carrying <ElseFilter/> — it assumes msSLDParseRule added one class. When the rule has no symbolizer (a structurally valid SLD), msSLDParseRule adds zero, and _SLDApplyRuleValues ends up indexing _class[-1], resulting in a NULL pointer dereference. A 200-byte well-formed SLD via the WMS SLD_BODY= parameter is enough to trigger this, no auth required. This vulnerability is fixed in 8.6.3.

Affected configurations

• osgeo mapserver (>= 6.4.0 < 8.6.3)

Related

Weakness · CWE (2)

  • CWE-129 Improper Validation of Array Index weakness
  • CWE-476 NULL Pointer Dereference weakness

References