UBUNTU-CVE-2026-11404

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Source

https://ubuntu.com/security/CVE-2026-11404

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11404.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-11404

Upstream

CVE-2026-11404

Published

2026-07-09T16:16:00Z

Modified

2026-10-17T12:58:04Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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.

References

Affected packages

Ubuntu:26.10 / mongoose

Package

Name: mongoose
Purl: pkg:deb/ubuntu/mongoose?arch=source&distro=stonking

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.21+ds-1

7.21+ds-2

7.22+ds-1

7.23+ds-1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "mongoose-webserver-source",
            "binary_version":  "7.23+ds-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11404.json"