CVE-2026-73255CWE-22path-traversal

CVE-2026-73255

Medium · published August 20, 2026

CVSS v3.1
6.5
EPSS
1%
Percentile
50.8
In the wild
Unconfirmed
What it is

Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can control an SSI-enabled file can place directory traversal sequences in an #include file or #include virtual directive. The mg_ssi() function in src/ssi.c concatenates the directive argument into a filesystem path without calling mg_path_is_sane(), allowing an MG_ENABLE_SSI deployment with ssi_pattern configured to disclose files readable by the Mongoose process. This issue is fixed in version 7.22.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00657 · 50.8th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-08-20T22:16Z
Affected products (1)
ProductVersionsFixed in
cesanta/mongoose< 7.227.22
References (4)
https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71 · [email protected]https://github.com/cesanta/mongoose/pull/3611 · [email protected]https://github.com/cesanta/mongoose/releases/tag/7.22 · [email protected]https://github.com/cesanta/mongoose/security/advisories/GHSA-h7m9-764r-7x4x · [email protected]
EPSS history
Timeline
  • 20 AUG 17:40Z
    Mongoose: Path traversal in SSI #include directives enables arbitrary file read
    cvelistv5