{"id":"UBUNTU-CVE-2026-73255","details":"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.","modified":"2026-10-17T13:01:01.853696882Z","published":"2026-08-20T18:16:00Z","upstream":["CVE-2026-73255"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-73255"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-73255"}],"affected":[{"package":{"name":"mongoose","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/mongoose?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.21+ds-1","7.21+ds-2","7.22+ds-1","7.23+ds-1"],"ecosystem_specific":{"binaries":[{"binary_name":"mongoose-webserver-source","binary_version":"7.23+ds-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73255.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}