SB2026042026 - Fedora 43 update for mapserver
Published: April 20, 2026
Security Bulletin ID
SB2026042026
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-33721)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds write in msSLDParseRasterSymbolizer when parsing a crafted SLD ColorMap/Categorize structure with more than 100 Threshold elements. A remote attacker can send a specially crafted SLD request to cause a denial of service.
The issue is commonly reachable via WMS GetMap with SLD_BODY, depending on deployment configuration.
Remediation
Install update from vendor's website.