{"id":"CVE-2026-64607","aliases":["GHSA-hjcp-jmpx-g3qm"],"url":"https://o3.security/vulnerability/CVE-2026-64607","summary":"Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS","details":"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.","published":"2026-07-31T10:12:18.035Z","modified":"2026-08-15T11:31:03.828353566Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":{"score":0.00482,"percentile":0.39385,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.httpcomponents.client5:httpclient5","fixedVersion":"5.6.3"}],"fix":null,"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/08/13/5"},{"type":"WEB","url":"https://repo.maven.apache.org/maven2/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64607.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64607"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-15T11:31:03.828353566Z"}}