CVE-2026-73257

CVE-2026-73257 · Mongoose: Content-Length + Transfer-Encoding coexistence enables request smuggling

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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.

CVSS 9.1 · Critique · EPSS 0,7% · Correctif disponible

Publication

2026-08-20T17:30:58.424Z

Mise à jour

2026-08-20T19:34:58.840Z

Pile logicielle: system

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