CVE-2026-73257 - Mongoose: Content-Length + Transfer-Encoding coexistence enables request smuggling
Brief
CVE ID : CVE-2026-73257
Published : Aug. 20, 2026, 6:16 p. m.
- 52 minutes ago
Description : 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.
- Severity: 9.1
- CRITICAL
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