Quinn affected by unauthenticated remote DoS via panic in QUIC transport parameter parsing

{
  "id": "1c1671da37a41e910c64d18600e5f66c7f1fe9ed002fb58fef94928638d2abab",
  "url": "https://osv.dev/vulnerability/CVE-2026-31812",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Quinn affected by unauthenticated remote DoS via panic in QUIC transport parameter parsing",
    "summary": "Quinn is a pure-Rust, async-compatible implementation of the IETF QUIC transport protocol. Prior to 0.11.14, a remote, unauthenticated attacker can trigger a denial of service in applications using vulnerable quinn versions by sending a crafted QUIC Initial packet containing malformed quic_transport_parameters. In quinn-proto parsing logic, attacker-controlled varints are decoded with unwrap(), so truncated encodings cause Err(UnexpectedEnd) and panic. This is reachable over the network with a single packet and no prior trust or authentication. This vulnerability is fixed in 0.11.14.",
    "evidence": "osv:CVE-2026-31812",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-31812",
      "aliases": [
        "CVE-2026-31812",
        "GHSA-6xvm-j4wr-6v98",
        "RUSTSEC-2026-0037"
      ],
      "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/quinn-rs/quinn",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2c315aa7f9c2a6c1db87f8f51f40623a427c78fd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.11.14"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.11.14"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "quinn-udp-0.5.14",
            "quinn-proto-0.11.13",
            "quinn-0.11.9",
            "quinn-udp-0.5.13",
            "quinn-proto-0.11.12",
            "quinn-0.11.8",
            "quinn-udp-0.5.12",
            "quinn-proto-0.11.11",
            "quinn-udp-0.5.11",
            "quinn-proto-0.11.10",
            "quinn-0.11.7",
            "quinn-udp-0.5.10",
            "quinn-udp-0.5.9",
            "quinn-udp-0.5.8",
            "quinn-proto-0.11.9",
            "quinn-0.11.6",
            "quinn-udp-0.5.7",
            "quinn-udp-0.5.6",
            "quinn-udp-0.5.5",
            "quinn-proto-0.11.8",
            "quinn-0.11.5",
            "quinn-proto-0.11.7",
            "quinn-0.11.4",
            "quinn-proto-0.11.6",
            "quinn-0.11.3",
            "quinn-proto-0.11.5",
            "quinn-proto-0.11.4",
            "quinn-udp-0.5.4",
            "quinn-udp-0.5.3",
            "quinn-udp-0.5.2",
            "quinn-proto-0.11.3",
            "quinn-0.11.2",
            "0.11.2",
            "0.11.1",
            "0.11.0",
            "0.9.3",
            "0.10.1",
            "0.10.0",
            "0.9.2",
            "0.9.1",
            "0.9.0",
            "udp-0.2.0",
            "0.8.0",
            "0.7.0",
            "0.6.1",
            "0.6.0",
            "0.5.0",
            "0.4.0",
            "0.3.0",
            "0.2.0",
            "0.1.0",
            "pre-quinn-quicr"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31812.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.018727894Z",
      "provider": "osv",
      "references": [
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31812.json",
        "https://access.redhat.com/errata/RHSA-2026:13545",
        "https://access.redhat.com/errata/RHSA-2026:19712",
        "https://access.redhat.com/errata/RHSA-2026:22862",
        "https://access.redhat.com/errata/RHSA-2026:5459",
        "https://access.redhat.com/security/cve/CVE-2026-31812",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31812.json",
        "https://github.com/quinn-rs/quinn/security/advisories/GHSA-6xvm-j4wr-6v98",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31812",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2446330"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-248"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31812.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-31812",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500961,
  "published_at": "2026-03-10T21:04:36.812+00:00"
}