CVE-2026-73257
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 7.22.
How to fix
- cesanta mongoose7.22 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cesanta mongoose | v < 7.22 | 7.22 |
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