{
  "cvss": 7.5,
  "datePublished": "2026-07-01T18:16:34.507",
  "dateUpdated": "2026-10-25T17:10:00.197",
  "description": "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.",
  "id": "CVE-2026-54428",
  "raw": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2/",
            "defaultStatus": "unaffected",
            "packageName": "org.apache.httpcomponents.core5:httpcore5-h2",
            "product": "Apache HttpComponents Core",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "5.5-beta1",
                "status": "affected",
                "version": "5.5-alpha",
                "versionType": "maven"
              },
              {
                "lessThanOrEqual": "5.4.2",
                "status": "affected",
                "version": "5.0-alpha",
                "versionType": "maven"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:apache:httpcomponents_core:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "A8EEC5B5-1DF7-46C6-BDF1-682D12E33F04",
                "versionEndIncluding": "5.4.2",
                "versionStartIncluding": "5.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:apache:httpcomponents_core:5.5:alpha1:*:*:*:*:*:*",
                "matchCriteriaId": "3A6F1338-5376-4581-AF9B-202B62133A9F",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:apache:httpcomponents_core:5.5:beta1:*:*:*:*:*:*",
                "matchCriteriaId": "860D474E-62CA-463F-AD9A-B7C44C148CD2",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "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."
      },
      {
        "lang": "es",
        "value": "Asignación de recursos sin límites ni estrangulamiento en el decodificador HPACK de HTTP/2 en Apache HttpComponents Core (5.4.2 y anteriores, 5.5-beta1 y anteriores) permite a un atacante remoto causar una denegación de servicio mediante el agotamiento de la memoria enviando bloques de cabecera comprimidos de tamaño excesivo antes de que el reconocimiento de SETTINGS de HTTP/2 provoque que se aplique el límite de tamaño de la lista de cabeceras configurado."
      }
    ],
    "id": "CVE-2026-54428",
    "lastModified": "2026-10-25T17:10:00.197",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 3.6,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-54428",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-07-01T18:15:24.114171Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-07-01T18:16:34.507",
    "references": [
      {
        "source": "security@apache.org",
        "tags": [
          "Mitigation",
          "Vendor Advisory"
        ],
        "url": "https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd"
      },
      {
        "source": "af854a3a-2127-422b-91ae-364da2661108",
        "tags": [
          "Mitigation",
          "Third Party Advisory"
        ],
        "url": "http://www.openwall.com/lists/oss-security/2026/07/01/3"
      }
    ],
    "sourceIdentifier": "security@apache.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-400"
          },
          {
            "lang": "en",
            "value": "CWE-770"
          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  },
  "severity": "HIGH",
  "source": "nvd",
  "title": "Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache HttpComponents Core (5.4.2..."
}