NULL Pointer Dereference in MapServer Software for Web-Based GIS Applications
CVE-2026-45104

7.5HIGH

Key Information:

Vendor

Mapserver

Status
Mapserver
Vendor
CVE Published:
27 May 2026

What is CVE-2026-45104?

A NULL pointer dereference vulnerability exists in MapServer, affecting versions 6.4.0 through 8.6.2. This flaw is triggered when an is processed without a proper symbolizer, resulting in an attempt to index a class that doesn’t exist. A specially crafted request can exploit this issue without requiring authentication, potentially leading to application crashes. Users are advised to upgrade to version 8.6.3 or newer to mitigate this risk.

Affected Version(s)

MapServer >= 6.4.0, < 8.6.3

References

https://github.com/MapServer/MapServer/security/advisorie...
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.