CVE-2026-45104

7.5 HIGH

MapServer is a system for developing web-based GIS applications

Published: 2026-05-27 · Last updated: 2026-06-02

Severity and scoring

CVSS: 7.5 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-129, CWE-476

Affected products

Vendor	Product
osgeo	mapserver

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-45104
[Vendor advisory]https://github.com/MapServer/MapServer/security/advisories/GHSA-4h8g-378q-r75m

Related CVEs

Same vendor

CVE-2026-49014 — In GDAL 3.1.0 through 3.13.0, scanForGeometryContainers in the netCDF driver allows code execution via a stack-based buffer overflow (7.4 HIGH)
CVE-2026-8213 — A vulnerability has been found in OSGeo gdal up to 3.13.0dev-4 (5.3 MEDIUM)
CVE-2026-8212 — A flaw has been found in OSGeo gdal up to 3.13.0dev-4 (5.3 MEDIUM)

Same CWE

CVE-2026-53463 — ImageMagick is free and open-source software used for editing and manipulating digital images (4.3 MEDIUM)
CVE-2026-45624 — ImageMagick is free and open-source software used for editing and manipulating digital images (5.1 MEDIUM)
CVE-2026-45359 — ImageMagick is free and open-source software used for editing and manipulating digital images (5.7 MEDIUM)
CVE-2026-24716 — A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions
CVE-2026-22899 — A NULL pointer dereference vulnerability has been reported to affect File Station 6