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CVE-2026-11404

Cesanta Mongoose Out-of-Bounds Read in MG_TLS_BUILTIN ClientHello Session ID Parsing PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Cesanta / Mongooseaffected 0 before 7.22

CWE

CWE-125

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.