CVE-2026-73255

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductCesanta Mongoose

PublishedAug 20, 2026

First seenAug 20, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

cesanta mongoose7.22 or later

Affected products

Product	Affected versions	Fixed in
cesanta mongoose	v < 7.22	7.22

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