CVE-2026-11404

HIGH SEVERITY

CVSS Score & Metrics

Base Score

7.5 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H                                    

Vulnerability Description

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.

Vulnerability Details

Published Date

July 09, 2026

Last Modified

July 09, 2026

CWE ID

CWE-125

Source

NVD

Vendor

Cesanta

Product

Mongoose

External References

https://github.com/cesanta/mongoose
https://github.com/cesanta/mongoose/commit/c288ac1f38424ffdd4d2fd5e1893fd4962642db3
https://github.com/cesanta/mongoose/releases/tag/7.22
https://www.vulncheck.com/advisories/cesanta-mongoose-out-of-bounds-read-in-mg-tls-builtin-clienthello-session-id-parsing

CVE-2026-11404

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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