mongoose: Mongoose is an embedded web server and network library
CVE-2026-73256 is fixed in mongoose on 1 platform by DEBIAN-CVE-2026-73256 (version 7.22+ds-1), released August 21, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
Mongoose is an embedded web server and network library. Prior to 7.22, a remote unauthenticated attacker can exploit an HTTP/1.0 reverse-proxy deployment by sending a request with Transfer-Encoding: chunked and conflicting framing. The http_cb() function in src/http.c tests hm.proto.len with an impossible greater-than-eight condition even though mg_http_parse() requires an eight-byte protocol string, so is_http_1_0 is never set. Mongoose consequently processes chunked encoding that an HTTP/1.0 proxy can ignore, enabling request smuggling and unauthorized access or state changes. This issue is fixed in version 7.22.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mongoose · Debian 14 | 7.22+ds-1 | DEBIAN-CVE-2026-73256 | Aug 21, 2026 |
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