Description
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.
Affected products
cesanta: mongoose
References4
- github.com/cesanta/mongoose/security/advisories/GHSA-h7m9-764r-… ExploitVendor Advisory
- github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9c… Patch
- github.com/cesanta/mongoose/pull/3611 Issue TrackingPatch
- github.com/cesanta/mongoose/releases/tag/7.22 Release Notes
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 1% percentile: 52 · as of 10 November 2026
- CWE
- CWE-22
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