CVE-2026-33721

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Source
https://cve.org/CVERecord?id=CVE-2026-33721
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33721.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33721
Aliases
  • GHSA-cv4m-mr84-fgjp
Downstream
Related
Published
2026-03-27T00:15:00.360Z
Modified
2026-08-12T03:51:35.616862622Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
MapServer has heap buffer overflow in SLD `Categorize` Threshold parsing
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33721.json"
}
References

Affected packages

Git / github.com/mapserver/mapserver

Affected ranges

Type
GIT
Repo
https://github.com/mapserver/mapserver
Events
Introduced
8d58e49d129e88e3d319f02be3c8ca65ae7d6de8
Fixed
292d06f99f427ff4ea54720849659cbd9f8cfef8
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "4.2"
        },
        {
            "fixed": "8.6.1"
        },
        {
            "introduced": "4.2.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:osgeo:mapserver:*:*:*:*:*:*:*:*"
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33721.json"