Signal is active with 2 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
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 (… https://www.cve.org/CVERecord?id=CVE-2026-33721
Post summary
MapServer versions 4.2 through 8.6.1 are vulnerable to a heap-buffer-overflow write triggered via the SLD interface, as identified in CVE-2026-33721.
⚡ New CVE Alert: CVE-2026-33721 📊 Severity: 5.3 🚨 Risk Level: Medium 🧩 Affects: Multiple / Unspecified Products Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-33721 #CVE-2026-33721 #CVE #Medium #CyberSecurity #InfoSec https://t.co/zF5hZkHYjY
Post summary
The tweet reports a newly disclosed CVE with a moderate severity score but provides no further technical, exploit, or mitigation details.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | osgeo | mapserver | - | - | - |