mongoose — security advisory

{
  "id": "8345c8ed9ccf2c7fc8d4d94251881e73e2a6190ff68870730cfecd133f21fca4",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-73260",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-73260",
    "summary": "Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TLS certificate parser selected by MG_TLS_BUILTIN fails to verify that a long-form DER element length fits within the remaining certificate buffer. In mg_der_to_tlv() and mg_der_next(), a peer-controlled length can advance the parser beyond the certificate and underflow the remaining uint32_t length, causing mg_tls_parse_cert_der() to continue walking an invalid pointer. An unauthenticated malicious TLS server, or a client presenting a certificate to a server configured for client certificates, can trigger an out-of-bounds read and denial of service during the handshake. This issue is fixed in version 7.23.",
    "evidence": "osv:DEBIAN-CVE-2026-73260",
    "products": [
      {
        "name": {
          "value": "mongoose",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.23+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",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "7.22+ds-1~bpo13+1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "7.23+ds-1~bpo13+1",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-73260",
      "aliases": [
        "DEBIAN-CVE-2026-73260"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7.23+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",
            "7.22+ds-1~bpo13+1",
            "7.23+ds-1~bpo13+1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73260.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-23T17:47:47.556570771Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-73260"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-73260"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-73260",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 418963,
  "published_at": "2026-10-14T19:17:19.84+00:00"
}