mongoose — security advisory

{
  "id": "f98f806d54e76e02850b61d46d55e937e4ee5b9c3f5b7a6ec3c25a58e910b853",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-11404",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-11404",
    "summary": "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.",
    "evidence": "osv:DEBIAN-CVE-2026-11404",
    "products": [
      {
        "name": {
          "value": "mongoose",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.22+ds-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "7.21+ds-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "7.21+ds-1~bpo13+1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "7.21+ds-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "7.22+ds-1~bpo13+1",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-11404",
      "aliases": [
        "DEBIAN-CVE-2026-11404"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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/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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7.22+ds-1"
                }
              ]
            }
          ],
          "package": {
            "name": "mongoose",
            "purl": "pkg:deb/debian/mongoose?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "7.21+ds-1",
            "7.21+ds-1~bpo13+1",
            "7.21+ds-2",
            "7.22+ds-1~bpo13+1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-11404.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-26T11:47:35.641320021Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-11404"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-11404"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-11404",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 450869,
  "published_at": "2026-07-09T16:16:34.64+00:00"
}