{"id":"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.","aliases":["GHSA-hjcp-jmpx-g3qm"],"modified":"2026-08-15T11:31:03.828353566Z","published":"2026-07-31T10:12:18.035Z","related":["CGA-6655-wm2f-cqmx"],"database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"5.0-alpha"},{"last_affected":"5.6.2"}],"source":"AFFECTED_FIELD"},{"source":"DESCRIPTION","extracted_events":[{"introduced":"5.0-alpha1"},{"fixed":"5.6.2"}]}],"cna_assigner":"apache","cwe_ids":["CWE-772"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64607.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/httpcomponents-client","events":[{"introduced":"0"},{"fixed":"13408e3f33dfc3763c44fe96e0d00fa6f6ecc65d"}],"database_specific":{"extracted_events":[{"introduced":"5.0.0"},{"fixed":"5.6.3"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*"}}],"versions":["5.6-RC2","rel/v5.6-alpha1","5.6-alpha1-RC1","rel/v5.0-beta4","5.0-beta4-RC1","rel/v5.0-beta3","5.0-beta3-RC1","rel/v5.0-beta2","5.0-beta2-RC1","rel/v5.0-beta1","5.0-beta1-RC1","rel/v5.0-alpha3","5.0-alpha3-RC1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64607.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}