CVE-2026-11404
CVE-2026-11404 · Cesanta Mongoose Out-of-Bounds Read in MG_TLS_BUILTIN ClientHello Session ID Parsing
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Cesanta Mongoose before 7.22 contains an out-of-bounds read in the built-in TLS server function mg_tls_server_recv_hello(), which uses an attacker-controlled session_id_len byte from a TLS ClientHello as a buffer index without validating it against the length of received data. A remote, unauthenticated attacker can send a single crafted ClientHello with an oversized session id length to read past the receive buffer, crashing any HTTPS, MQTTS, or WSS service built on MG_TLS_BUILTIN.
CVSS 8.7 · High · EPSS 0.6% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
mongoose
- Versions
- ≥ 0, < 7.22: Affected (custom)
Update to 7.22
mongoose Debian:14
- Versions
- 7.21+ds-1
- 7.21+ds-1~bpo13+1
- 7.21+ds-2
- 7.22+ds-1~bpo13+1
- Affected ranges
- ECOSYSTEM: < 7.22+ds-1
Update to 7.22+ds-1
mongoose Ubuntu:26.10
- Versions
- 7.21+ds-1
- 7.21+ds-2
- 7.22+ds-1
- 7.23+ds-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published