Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK

{
  "id": "d10583abb858bf377a4f489dac159dc87894816a8af9403aab63919b38bfc7da",
  "url": "https://osv.dev/vulnerability/CVE-2026-54428",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK",
    "summary": "Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending oversized compressed header blocks before the HTTP/2 SETTINGS acknowledgement causes the configured header list size limit to be applied.",
    "evidence": "osv:CVE-2026-54428",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-54428",
      "aliases": [
        "CVE-2026-54428",
        "GHSA-v3jc-474w-2wm6"
      ],
      "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": [
            {
              "repo": "https://github.com/apache/httpcomponents-core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2e0dabfb84ad49c76b8932f0bc5d0d85365976de"
                },
                {
                  "last_affected": "4ee5b2a75b847f9f82a3bfec4524c2cb4f4fb3a6"
                },
                {
                  "introduced": "75f51152de1bc5b05dc5576d07c0bec96a5d9bcc"
                },
                {
                  "last_affected": "fe165c869e50356c677b319c4ebf32d656352be3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:httpcomponents_core:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.0"
                      },
                      {
                        "last_affected": "5.4.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apache:httpcomponents_core:5.5:alpha1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.5-alpha1"
                      },
                      {
                        "last_affected": "5.5-alpha1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:apache:httpcomponents_core:5.5:beta1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.5-beta1"
                      },
                      {
                        "last_affected": "5.5-beta1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.5-alpha1",
            "5.5-beta1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54428.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.139977428Z",
      "provider": "osv",
      "references": [
        "https://repo.maven.apache.org/maven2/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54428.json",
        "https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54428"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400",
          "CWE-770"
        ],
        "cna_assigner": "apache",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "5.5-alpha"
                  },
                  {
                    "last_affected": "5.5-beta1"
                  },
                  {
                    "introduced": "5.0-alpha"
                  },
                  {
                    "last_affected": "5.4.2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54428.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54428",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507767,
  "published_at": "2026-07-01T17:03:53.938+00:00"
}