CVE catalog
CVE-2026-33721
MapServer is a system for developing web-based GIS applications. Starting in version 4.2 and prior to version 8.6.1, a heap-buffer-overflow write in MapServer’s SLD (Styled Layer Descriptor) parser le
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.22% · Oct 27, 2026
MapServer is a system for developing web-based GIS applications. Starting in version 4.2 and prior to version 8.6.1, a heap-buffer-overflow write in MapServer’s SLD (Styled Layer Descriptor) parser lets a remote, unauthenticated attacker crash the MapServer process by sending a crafted SLD with more than 100 Threshold elements inside a ColorMap/Categorize structure (commonly reachable via WMS GetMap with SLD_BODY). Version 8.6.1 patches the issue.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | mapserver | sid | 8.6.6-1 | fixed |
| Debian | mapserver | forky | 8.6.6-1 | fixed |
| Debian | mapserver | trixie | 8.4.0-4+deb13u2 | fixed |
| Debian | mapserver | bookworm | 8.0.0-3+deb12u1 | fixed |
| Cpe | mapserver | Not reported | 8.6.1 | fixed |
| Opensuse | mapserver | tumbleweed | 8.6.1-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | mapserver | source | sid | 8.6.1-1 | not yet assigned | Not reported | Not reported |
| Debian | mapserver | source | forky | 8.6.1-1 | not yet assigned | Not reported | Not reported |
| Debian | mapserver | source | trixie | 8.4.0-4+deb13u2 | not yet assigned | Not reported | Not reported |
| Debian | mapserver | source | bookworm | 8.0.0-3+deb12u1 | not yet assigned | Not reported | Not reported |
| Cpe | mapserver | cpe | Not reported | 8.6.1 | Not reported | Not reported | Not reported |
| Opensuse | mapserver | rpm | tumbleweed | 8.6.1-1.1 | Not reported | OPENSUSE-SU-2026:10452-1 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [libjavamapscript]Unknown
Source package: [mapserver]
Details (1)
8.6.5-1.2· x86_64 · tumbleweedUnknown · Fixed:
8.6.1-1.1Version impact unknown
nvd · mapserver · opensuse · tumbleweed
- [libmapserver2]Unknown
Source package: [mapserver]
Details (1)
8.6.5-1.2· x86_64 · tumbleweedUnknown · Fixed:
8.6.1-1.1Version impact unknown
nvd · mapserver · opensuse · tumbleweed
- [mapserver-devel]Unknown
Source package: [mapserver]
Details (1)
8.6.5-1.2· x86_64 · tumbleweedUnknown · Fixed:
8.6.1-1.1Version impact unknown
nvd · mapserver · opensuse · tumbleweed
- [perl-mapscript]Unknown
Source package: [mapserver]
Details (1)
8.6.5-1.2· x86_64 · tumbleweedUnknown · Fixed:
8.6.1-1.1Version impact unknown
nvd · mapserver · opensuse · tumbleweed
- [php-mapscriptng]Unknown
Source package: [mapserver]
Details (1)
8.6.5-1.2· x86_64 · tumbleweedUnknown · Fixed:
8.6.1-1.1Version impact unknown
nvd · mapserver · opensuse · tumbleweed
- [python313-mapserver]Unknown
Source package: [mapserver]
Details (1)
8.6.5-1.2· x86_64 · tumbleweedUnknown · Fixed:
8.6.1-1.1Version impact unknown
nvd · mapserver · opensuse · tumbleweed
- [python314-mapserver]Unknown
Source package: [mapserver]
Details (1)
8.6.5-1.2· x86_64 · tumbleweedUnknown · Fixed:
8.6.1-1.1Version impact unknown
nvd · mapserver · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [cgi-mapserver]Fixed
Source package: [mapserver]
Details (4)
8.0.0-3+deb12u1· amd64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.0.0-3+deb12u1· arm64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
- [libmapscript-java]Fixed
Source package: [mapserver]
Details (4)
8.0.0-3+deb12u1· amd64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.0.0-3+deb12u1· arm64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
- [libmapscript-perl]Fixed
Source package: [mapserver]
Details (4)
8.0.0-3+deb12u1· amd64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.0.0-3+deb12u1· arm64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
- [libmapserver2]Fixed
Source package: [mapserver]
Details (4)
8.0.0-3+deb12u1· amd64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.0.0-3+deb12u1· arm64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
- [libmapserver-dev]Fixed
Source package: [mapserver]
Details (4)
8.0.0-3+deb12u1· amd64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.0.0-3+deb12u1· arm64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
- [mapserver-bin]Fixed
Source package: [mapserver]
Details (4)
8.0.0-3+deb12u1· amd64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.0.0-3+deb12u1· arm64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
- [mapserver-doc]Fixed
Source package: [mapserver]
Details (4)
8.0.0-3+deb12u1· all · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.0.0-3+deb12u1· all · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· all · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· all · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
- [php-mapscript-ng]Fixed
Source package: [mapserver]
Details (4)
8.0.0-3+deb12u1· amd64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.0.0-3+deb12u1· arm64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
- [python3-mapscript]Fixed
Source package: [mapserver]
Details (4)
8.0.0-3+deb12u1· amd64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.0.0-3+deb12u1· arm64 · bookwormFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
8.4.0-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
8.0.0-3+deb12u1nvd · mapserver · debian · bookworm; nvd · mapserver · debian · 12
[Debian 13 (Trixie)]
- [cgi-mapserver]Fixed
Source package: [mapserver]
Details (4)
8.4.0-4+deb13u2· amd64 · trixieFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.4.0-4+deb13u2· arm64 · trixieFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.6.5-1~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.6.5-1~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
- [libmapscript-java]Fixed
Source package: [mapserver]
Details (4)
8.4.0-4+deb13u2· amd64 · trixieFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.4.0-4+deb13u2· arm64 · trixieFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.6.5-1~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.6.5-1~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
- [libmapscript-perl]Fixed
Source package: [mapserver]
Details (4)
8.4.0-4+deb13u2· amd64 · trixieFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.4.0-4+deb13u2· arm64 · trixieFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.6.5-1~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.6.5-1~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
- [libmapserver2t64]Fixed
Source package: [mapserver]
Details (4)
8.4.0-4+deb13u2· amd64 · trixieFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.4.0-4+deb13u2· arm64 · trixieFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.6.5-1~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
8.6.5-1~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
8.4.0-4+deb13u2nvd · mapserver · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10452-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33721]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33721]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10452-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-33721]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33721.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]