9.1

CVE-2026-73257

Exploit

Mongoose: Content-Length + Transfer-Encoding coexistence enables request smuggling

Mongoose is an embedded web server and network library. Priro to version 7.22, a remote unauthenticated attacker can send an HTTP request containing both Content-Length and Transfer-Encoding: chunked. The cl_count and te_count checks in the mg_http_parse() and http_cb() paths in src/http.c accept both headers and prioritize chunked encoding, while a Content-Length-preferring reverse proxy can use a different request boundary. This CL.TE desynchronization can inject requests that access or modify resources in another user context. This issue is fixed in version 7.22.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Cesanta ≫ Mongoose Version < 7.22
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 9.1 3.9 5.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

https://github.com/cesanta/mongoose/releases/tag/7.22
Release Notes
https://github.com/cesanta/mongoose/pull/3611
Patch
Issue Tracking
https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71
Patch
https://github.com/cesanta/mongoose/security/advisories/GHSA-5wfq-r6mr-wqp6
Vendor Advisory
Exploit