Traefik: respondingTimeouts.readTimeout is not applied to HTTP/3, leaving slow-body uploads unbounded

{
  "id": "34c1c31e48fc1cfa4d2f049fbc28596d51ce8cff4bdd9f34607b8eb2bfec68be",
  "url": "https://osv.dev/vulnerability/CVE-2026-88012",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Traefik: respondingTimeouts.readTimeout is not applied to HTTP/3, leaving slow-body uploads unbounded",
    "summary": "Traefik is an open source HTTP reverse proxy and load balancer. From 2.8.2 until 2.11.56 and 3.7.12, HTTP/3 entrypoints do not apply entryPoints..transport.respondingTimeouts.readTimeout because the timeout is enforced on a TCP connection and the HTTP/3 server has no corresponding QUIC stream deadline. An unauthenticated client can use a slow request body, trickling data indefinitely while holding a request and an upstream connection open and exhausting backends with bounded connection pools. This issue is fixed in 2.11.56 and 3.7.12.",
    "evidence": "osv:CVE-2026-88012",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-88012",
      "aliases": [
        "CVE-2026-88012",
        "CVE-2026-88878",
        "GHSA-7ghq-v6jf-g56c",
        "GO-2026-6454"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/traefik/traefik",
              "type": "GIT",
              "events": [
                {
                  "introduced": "23c26d64eeb72eaecaecedc31ca740e83304fde2"
                },
                {
                  "fixed": "d87731461f0c7beb6fdbcc5a5655a44ce56e537a"
                },
                {
                  "introduced": "d99d2f95e66a28ee8180634dc80fdf13ba68c62a"
                },
                {
                  "fixed": "e8f398ee30ca5643158ea9094b701b8eae9849e5"
                },
                {
                  "fixed": "a8d0bc425859dde7481a6c9a324e610b81d754d0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.8.2"
                      },
                      {
                        "fixed": "2.11.56"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "3.7.12"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a8d0bc425859dde7481a6c9a324e610b81d754d0"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d87731461f0c7beb6fdbcc5a5655a44ce56e537a"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.11.56"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e8f398ee30ca5643158ea9094b701b8eae9849e5"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v3.7.12"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88012.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.964491071Z",
      "provider": "osv",
      "references": [
        "https://github.com/traefik/traefik/releases/tag/v2.11.56",
        "https://github.com/traefik/traefik/releases/tag/v3.7.12",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88012.json",
        "https://github.com/traefik/traefik/security/advisories/GHSA-7ghq-v6jf-g56c",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-88012",
        "https://github.com/traefik/traefik/commit/a8d0bc425859dde7481a6c9a324e610b81d754d0",
        "https://github.com/traefik/traefik/pull/13717"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88012.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-88012",
        "evidence": "/id"
      },
      {
        "value": "CVE-2026-88878",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505129,
  "published_at": "2026-09-10T15:35:12.851+00:00"
}