{"id":"GHSA-hjcp-jmpx-g3qm","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":["CVE-2026-64607"],"modified":"2026-08-13T21:11:16.577425Z","published":"2026-07-31T12:30:30Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-08-13T18:40:18Z","nvd_published_at":"2026-07-31T11:17:11Z","cwe_ids":["CWE-772"],"severity":"MODERATE"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64607"},{"type":"WEB","url":"https://github.com/apache/httpcomponents-client/commit/55733f4121f7ba26ddf04fe12739d9c15962cb94"},{"type":"WEB","url":"https://github.com/apache/httpcomponents-client/commit/ebac9512f555c4a355cad3f59ef2db69b597cc97"},{"type":"PACKAGE","url":"https://github.com/apache/httpcomponents-client"},{"type":"WEB","url":"https://github.com/apache/httpcomponents-client/releases/tag/rel/v5.6.3"},{"type":"WEB","url":"https://github.com/apache/httpcomponents-client/releases/tag/rel/v5.7-alpha1"},{"type":"WEB","url":"https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/08/13/5"}],"affected":[{"package":{"name":"org.apache.httpcomponents.client5:httpclient5","ecosystem":"Maven","purl":"pkg:maven/org.apache.httpcomponents.client5/httpclient5"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0-alpha1"},{"fixed":"5.6.3"}]}],"versions":["5.0","5.0-alpha1","5.0-alpha2","5.0-alpha3","5.0-beta1","5.0-beta2","5.0-beta3","5.0-beta4","5.0-beta5","5.0-beta6","5.0-beta7","5.0.1","5.0.2","5.0.3","5.0.4","5.1","5.1-beta1","5.1.1","5.1.2","5.1.3","5.1.4","5.2","5.2-alpha1","5.2-beta1","5.2.1","5.2.2","5.2.3","5.3","5.3-alpha1","5.3.1","5.4","5.4-alpha1","5.4-alpha2","5.4-beta1","5.4.1","5.4.2","5.4.3","5.4.4","5.5","5.5-alpha1","5.5.1","5.5.2","5.6","5.6-alpha1","5.6.1","5.6.2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-hjcp-jmpx-g3qm/GHSA-hjcp-jmpx-g3qm.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"}]}