Apache Traffic Server: HPACK encoder desynchronizes from the decoder after a failed header encode

{
  "id": "6720d71b715252be98a435733cb559dbe93b38b41a4be3bc93099887007265c6",
  "url": "https://osv.dev/vulnerability/CVE-2026-65100",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Apache Traffic Server: HPACK encoder desynchronizes from the decoder after a failed header encode",
    "summary": "Apache Traffic Server updates the HTTP/2 HPACK dynamic table before confirming the header block encoded successfully, so an encode failure leaves the encoder out of sync with the peer decoder and corrupts subsequent header blocks on the connection. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.",
    "evidence": "osv:CVE-2026-65100",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-65100",
      "aliases": [
        "CVE-2026-65100"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/trafficserver",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b310e3566f58dd04ec2b15b111ec86ea70e20019"
                },
                {
                  "last_affected": "796ffd3a329b4b1f2ec0dd51158e62c94914c4ca"
                },
                {
                  "introduced": "b14030656330ed623cd1f9efe2f4f9abd9d16e29"
                },
                {
                  "fixed": "f671e525110be50452f607fc1f2657f3dba7fe3b"
                },
                {
                  "introduced": "3fa146678bc6a061722f4ea930998ae29ad70de3"
                },
                {
                  "fixed": "f8be6725daee427fbf88f166f14b10cb5525b220"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "last_affected": "8.1.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "9.0.0"
                      },
                      {
                        "fixed": "9.2.15"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "10.0.0"
                      },
                      {
                        "fixed": "10.1.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "8.1.9-rc0",
            "8.1.9",
            "8.1.8",
            "8.1.8-rc0",
            "8.1.7-rc0",
            "8.1.7",
            "8.1.6-rc0",
            "8.1.6",
            "8.1.5-rc0",
            "8.1.5",
            "8.1.4-rc0",
            "8.1.4",
            "8.1.3-rc1",
            "8.1.3",
            "8.1.3-rc0",
            "8.1.2-rc0",
            "8.1.1-rc0",
            "8.1.1",
            "8.1.0-rc0",
            "8.1.0",
            "8.0.6-rc1",
            "8.0.6",
            "8.0.6-rc0",
            "8.0.5",
            "8.0.4",
            "8.0.4-rc0",
            "8.0.3-rc0",
            "8.0.3",
            "8.0.2-rc0",
            "8.0.2",
            "8.0.1-rc0",
            "8.0.1",
            "8.0.0-rc4",
            "8.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-65100.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.592123095Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65100.json",
        "https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-65100"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-696"
        ],
        "cna_assigner": "apache",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.0.0"
                  },
                  {
                    "last_affected": "8.1.11"
                  },
                  {
                    "introduced": "9.0.0"
                  },
                  {
                    "last_affected": "9.2.14"
                  },
                  {
                    "introduced": "10.0.0"
                  },
                  {
                    "last_affected": "10.1.3"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65100.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-65100",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 502043,
  "published_at": "2026-07-29T09:06:17.226+00:00"
}