CVE-2026-73255

MEDIUM 6.5

Mongoose: Path traversal in SSI #include directives enables arbitrary file read

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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	CWE-22
Vendor	cesanta
Product	mongoose
Published	Aug 20, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

cesanta / mongoose

< 7.22

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/cesanta/mongoose/security/advisories/GHSA-h7m9-764r-7x4x github.com: https://github.com/cesanta/mongoose/pull/3611 github.com: https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71 github.com: https://github.com/cesanta/mongoose/releases/tag/7.22