CVE-2026-64607

{
  "id": "CVE-2026-64607",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-31T11:17:11.710",
  "lastModified": "2026-10-23T23:10:00.157",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "HttpClient based on the classic i/o model fails to correctly release the underlying connection back to the connection manager if it encounters an invalid or unsupported `Content-Encoding` header value in the response message. Please note this defect does not affect HttpClient based on the async i/o model.\n\nThis issue affects Apache HttpComponents Client: from 5.0-alpha1 through 5.6.2."
    },
    {
      "lang": "es",
      "value": "HttpClient basado en el modelo de E/S clásico no logra liberar correctamente la conexión subyacente de vuelta al gestor de conexiones si encuentra un valor de encabezado ’Content-Encoding’ inválido o no compatible en el mensaje de respuesta. Tenga en cuenta que este defecto no afecta a HttpClient basado en el modelo de E/S asíncrono.\n\nEste problema afecta a Apache HttpComponents Client: desde 5.0-alpha1 hasta 5.6.2."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache HttpComponents Client",
          "defaultStatus": "unaffected",
          "collectionURL": "https://repo.maven.apache.org/maven2/",
          "packageName": "org.apache.httpcomponents.client5:httpclient5",
          "versions": [
            {
              "version": "5.0-alpha",
              "lessThanOrEqual": "5.6.2",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-31T16:24:59.439841Z",
          "id": "CVE-2026-64607",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-772"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.0.0",
              "versionEndExcluding": "5.6.3",
              "matchCriteriaId": "D5B8B944-BED3-4FAE-B271-8B9B8B22A15D"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q",
      "source": "[email protected]",
      "tags": [
        "Mailing List",
        "Release Notes"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/08/13/5",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}