{"id":"CVE-2026-64607","state":"PUBLISHED","title":"Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS","description":"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.","publishedAt":"2026-07-31T10:12:18.035Z","updatedAt":"2026-08-13T16:18:20.395Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"CISA-ADP"},"assigner":"apache","products":["Apache Software Foundation Apache HttpComponents Client"],"affected":[{"vendor":"Apache Software Foundation","product":"Apache HttpComponents Client","packageName":"org.apache.httpcomponents.client5:httpclient5","defaultStatus":"unaffected","versions":[{"version":"5.0-alpha","status":"affected","lessThanOrEqual":"5.6.2","versionType":"semver"}],"collectionURL":"https://repo.maven.apache.org/maven2/"}],"references":["https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q","http://www.openwall.com/lists/oss-security/2026/08/13/5"],"weaknesses":["CWE-772"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64607.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64607","state":"PUBLISHED","datePublished":"2026-07-31T10:12:18.035Z","dateUpdated":"2026-08-13T16:18:20.395Z","assignerShortName":"apache","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateReserved":"2026-07-20T08:23:45.493Z"},"containers":{"cna":{"title":"Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS","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."}],"affected":[{"vendor":"Apache Software Foundation","product":"Apache HttpComponents Client","packageName":"org.apache.httpcomponents.client5:httpclient5","defaultStatus":"unaffected","versions":[{"version":"5.0-alpha","status":"affected","lessThanOrEqual":"5.6.2","versionType":"semver"}],"collectionURL":"https://repo.maven.apache.org/maven2/"}],"references":[{"url":"https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q","tags":["vendor-advisory"]}],"metrics":[{"other":{"content":{"text":"important"},"type":"Textual description of severity"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-772","description":"CWE-772 Missing Release of Resource after Effective Lifetime","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"apache","orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateUpdated":"2026-08-13T08:51:47.972Z"},"credits":[{"lang":"en","type":"finder","value":"Yu Bao from PayPal Cyber Security Team"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-31T16:24:59.439841Z","id":"CVE-2026-64607","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-31T16:25:02.593Z"}},{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/08/13/5"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-08-13T16:18:20.395Z"}}]}}}