CVE catalog

CVE-2026-11404

DEBIAN-CVE-2026-11404

Severity: Unknown · CVSS 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Jul 9, 2026, 3:13:40 PM UTC
Updated: Oct 1, 2026, 3:01:44 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.61% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	mongoose	14	`7.21+ds-1`	vulnerable
Debian	mongoose	14	`7.21+ds-1~bpo13+1`	vulnerable
Debian	mongoose	14	`7.21+ds-2`	vulnerable
Debian	mongoose	14	`7.22+ds-1~bpo13+1`	vulnerable
Debian	mongoose	14	`7.22+ds-1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	mongoose	deb	14	`7.22+ds-1`	Not reported	DEBIAN-CVE-2026-11404	Not reported

OpenFactory catalog packages

No matching packages in this catalog.

Observed: Oct 23, 2026, 9:44:24 PM UTC

References

[FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]