CVE-2026-73256 - Mongoose: HTTP/1.0 detection off-by-one enables request smuggling via chunked TE
Brief
CVE ID : CVE-2026-73256
Published : Aug. 20, 2026, 6:16 p. m.
- 52 minutes ago
Description : 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.
- Severity: 9.1
- CRITICAL
Visit the link for more details, such as CVSS details, affected products, timeline, and more...