Traefik's ACME TLS-ALPN fast path lacks timeouts and close on handshake stall

{
  "id": "6373b43598f515eca3c184752b328954251ebe5a6a91e306b5dce7d086a0d995",
  "url": "https://osv.dev/vulnerability/CVE-2026-22045",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Traefik's ACME TLS-ALPN fast path lacks timeouts and close on handshake stall",
    "summary": "Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.35 and 3.6.7, there is a potential vulnerability in Traefik ACME TLS certificates' automatic generation: the ACME TLS-ALPN fast path can allow unauthenticated clients to tie up go routines and file descriptors indefinitely when the ACME TLS challenge is enabled. A malicious client can open many connections, send a minimal ClientHello with acme-tls/1, then stop responding, leading to denial of service of the entry point. The vulnerability is fixed in 2.11.35 and 3.6.7.",
    "evidence": "osv:CVE-2026-22045",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-22045",
      "aliases": [
        "CVE-2026-22045",
        "GHSA-cwjm-3f7h-9hwq",
        "GO-2026-4322"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/traefik/traefik",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "9e5d4ba5a1cdcf3465630cef858945f90f6b4279"
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                  "introduced": "d99d2f95e66a28ee8180634dc80fdf13ba68c62a"
                },
                {
                  "fixed": "17283643416ef8e830565ce40d3d3d7cc453e68e"
                },
                {
                  "fixed": "e9f3089e9045812bcf1b410a9d40568917b26c3d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.11.35"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "3.6.7"
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                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e9f3089e9045812bcf1b410a9d40568917b26c3d"
                      }
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                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9e5d4ba5a1cdcf3465630cef858945f90f6b4279"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.11.35"
                  },
                  {
                    "range": [
                      {
                        "fixed": "17283643416ef8e830565ce40d3d3d7cc453e68e"
                      }
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                    "source": "REFERENCES_TAG",
                    "original_tag": "v3.6.7"
                  }
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              }
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-22045.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.353179493Z",
      "provider": "osv",
      "references": [
        "https://github.com/traefik/traefik/releases/tag/v2.11.35",
        "https://github.com/traefik/traefik/releases/tag/v3.6.7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22045.json",
        "https://github.com/traefik/traefik/security/advisories/GHSA-cwjm-3f7h-9hwq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-22045",
        "https://github.com/traefik/traefik/commit/e9f3089e9045812bcf1b410a9d40568917b26c3d"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22045.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-22045",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496080,
  "published_at": "2026-01-15T22:44:05.423+00:00"
}