CVE-2025-59431: MapServer is a system for developing web-based GIS applications

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-59431 is a critical-severity flaw (CVSS 9.8) affecting mapserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MapServer is a system for developing web-based GIS applications. Prior to 8.4.1, the XML Filter Query directive PropertyName is vulnerably to Boolean-based SQL injection. It seems like expression checking is bypassed by introducing double quote characters in the PropertyName. Allowing to manipulate backend database queries. This vulnerability is fixed in 8.4.1.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-89
Published	2025-09-19
Last modified	2026-10-19

Publisher (CNA): GitHub, Inc. · Vendor: osgeo

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-19 20:15 UTCPublished CVE record published
2026-10-19 16:10 UTCUpdated Record last modified

osgeo mapserver DOWNGRADE

Affected: 8.4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.4.0

1. Check installed version

apt-cache policy mapserver || rpm -q mapserver || mapserver --version

2. No fixed release: DOWNGRADE to a release before 8.4.0 (Debian / Ubuntu)

apt-cache madison mapserver sudo apt install mapserver=<VERSION_BEFORE_8.4.0> sudo apt-mark hold mapserver

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mapserver sudo dnf downgrade mapserver-<VERSION_BEFORE_8.4.0> sudo dnf versionlock add mapserver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-59431?

mapserver: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-59431 being exploited?

CVE-2025-59431 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-59431 affect?

CVE-2025-59431 affects mapserver. Severity is critical (CVSS 9.8). MapServer is a system for developing web-based GIS applications. Prior to 8.4.1, the XML Filter Query directive PropertyName is vulnerably to Boolean-based SQL injection. It seems like expression checking is bypassed by introducing double q

How urgent is CVE-2025-59431?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-45104 HIGH 7.5 UPGRADE MapServer is a system for developing web-based GIS applications
CVE-2026-42030 MEDIUM 6.1 UPGRADE MapServer is a system for developing web-based GIS applications
CVE-2026-33721 MEDIUM 5.3 UPGRADE MapServer is a system for developing web-based GIS applications
CVE-2021-32062 MEDIUM 5.3 UPGRADE MITIGATE MapServer before 7.0.8, 7.1.x and 7.2.x before 7.2.3, 7.3.x and 7.4.x before 7.4.5, and 7.5.x and 7.6.x before
CVE-2017-5522 CRITICAL 9.8 MITIGATE UPGRADE Stack-based buffer overflow in MapServer before 6.0.6, 6.2.x before 6.2.4, 6.4.x before 6.4.5, and 7.0.x befor

References

← Back to latest CVEs