Out-of-bounds write in MapServer - #VU147312
Published: September 7, 2026
Vulnerability identifier: #VU147312
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a heap-based out-of-bounds write in msInterpolationDataset() in src/interpolation.c when processing WMS GetMap requests with an output grid smaller than the sample count. A remote attacker can send a crafted WMS GetMap request with small WIDTH and HEIGHT values to cause a denial of service.
The vulnerable layer uses CONNECTIONTYPE IDW or CONNECTIONTYPE KERNELDENSITY.
Affected software
MapServer
Remediation
Install security update from vendor's website.
MapServer - update to 8.6.6