CVE-2026-73255

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.

• CWE-22

• https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71Patch
• https://github.com/cesanta/mongoose/pull/3611Issue Tracking, Patch
• https://github.com/cesanta/mongoose/releases/tag/7.22Release Notes
• https://github.com/cesanta/mongoose/security/advisories/GHSA-h7m9-764r-7x4xExploit, Vendor Advisory

Published

Aug 20, 2026

Last Modified

Oct 18, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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