Path traversal in Mongoose - CVE-2026-73255
Published: August 12, 2026
Vulnerability identifier: #VU142189
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-73255
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to path traversal in the mg_ssi() function when processing SSI #include directives in .shtml files. A remote user can inject a crafted include path containing ../ sequences to disclose sensitive information.
Exploitation requires SSI support to be enabled, an ssi_pattern to be configured, and the ability to write or control the contents of an .shtml file.
Affected software
Mongoose
How to mitigate CVE-2026-73255
Install security update from vendor's website.
Mongoose - update to 7.22