CVE-2026-11404
High · 7.5CVSS
7.5
EPSS
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Published
Jul 9, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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Related vulnerabilities
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