{"api_version":"1","generated_at":"2026-10-04T01:01:11+00:00","cve":"CVE-2026-85718","urls":{"html":"https://cve.report/CVE-2026-85718","api":"https://cve.report/api/cve/CVE-2026-85718.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-85718","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-85718"},"summary":{"title":"AsyncHttpClient: Connection permit leak on TLS handshake failure causes per-host denial of service","description":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 3.0.8 until 3.0.12, a client with maxConnections or maxConnectionsPerHost set above zero leaks one connection permit whenever TLS connection establishment fails before the handshake completes. NettyConnectListener removes the partitionKeyLock permit from NettyResponseFuture before every failure path is bound to the channel closeFuture, so an abort can leave the permit unreleased. Repeated failures can permanently lock out one host under a per-host limit or drain the shared pool under a global limit, blocking later requests even when no connection remains open. The default unlimited connection setting is not affected. This issue is fixed in version 3.0.12.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-09-17 16:18:16","updated_at":"2026-09-30 17:43:24"},"problem_types":["CWE-400","CWE-772","CWE-400 CWE-400: Uncontrolled Resource Consumption","CWE-772 CWE-772: Missing Release of Resource after Effective Lifetime"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"5.9","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"5.9","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://github.com/AsyncHttpClient/async-http-client/issues/2189","name":"https://github.com/AsyncHttpClient/async-http-client/issues/2189","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/AsyncHttpClient/async-http-client/pull/2288","name":"https://github.com/AsyncHttpClient/async-http-client/pull/2288","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/AsyncHttpClient/async-http-client/commit/64eb57af52a003ae7f29a2f9f4502271bbb138dd","name":"https://github.com/AsyncHttpClient/async-http-client/commit/64eb57af52a003ae7f29a2f9f4502271bbb138dd","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-gcmv-gr82-6m8v","name":"https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-gcmv-gr82-6m8v","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-85718","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85718","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"AsyncHttpClient","product":"async-http-client","version":"affected >= 3.0.8, < 3.0.12","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"85718","cve":"CVE-2026-85718","epss":"0.005330000","percentile":"0.430150000","score_date":"2026-10-03","updated_at":"2026-10-04 00:03:20"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-85718","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-09-17T16:39:56.605072Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-09-17T16:40:07.831Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"product":"async-http-client","vendor":"AsyncHttpClient","versions":[{"status":"affected","version":">= 3.0.8, < 3.0.12"}]}],"descriptions":[{"lang":"en","value":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 3.0.8 until 3.0.12, a client with maxConnections or maxConnectionsPerHost set above zero leaks one connection permit whenever TLS connection establishment fails before the handshake completes. NettyConnectListener removes the partitionKeyLock permit from NettyResponseFuture before every failure path is bound to the channel closeFuture, so an abort can leave the permit unreleased. Repeated failures can permanently lock out one host under a per-host limit or drain the shared pool under a global limit, blocking later requests even when no connection remains open. The default unlimited connection setting is not affected. This issue is fixed in version 3.0.12."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-772","description":"CWE-772: Missing Release of Resource after Effective Lifetime","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-09-17T15:58:40.719Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-gcmv-gr82-6m8v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-gcmv-gr82-6m8v"},{"name":"https://github.com/AsyncHttpClient/async-http-client/issues/2189","tags":["x_refsource_MISC"],"url":"https://github.com/AsyncHttpClient/async-http-client/issues/2189"},{"name":"https://github.com/AsyncHttpClient/async-http-client/pull/2288","tags":["x_refsource_MISC"],"url":"https://github.com/AsyncHttpClient/async-http-client/pull/2288"},{"name":"https://github.com/AsyncHttpClient/async-http-client/commit/64eb57af52a003ae7f29a2f9f4502271bbb138dd","tags":["x_refsource_MISC"],"url":"https://github.com/AsyncHttpClient/async-http-client/commit/64eb57af52a003ae7f29a2f9f4502271bbb138dd"}],"source":{"advisory":"GHSA-gcmv-gr82-6m8v","discovery":"UNKNOWN"},"title":"AsyncHttpClient: Connection permit leak on TLS handshake failure causes per-host denial of service"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-85718","datePublished":"2026-09-17T15:58:40.719Z","dateReserved":"2026-09-04T14:45:10.648Z","dateUpdated":"2026-09-17T16:40:07.831Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 16:18:16","lastModifiedDate":"2026-09-30 17:43:24","problem_types":["CWE-400","CWE-772","CWE-400 CWE-400: Uncontrolled Resource Consumption","CWE-772 CWE-772: Missing Release of Resource after Effective Lifetime"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.2,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-17T16:39:56.605072Z","id":"CVE-2026-85718","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"85718","Ordinal":"1","Title":"AsyncHttpClient: Connection permit leak on TLS handshake failure","CVE":"CVE-2026-85718","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"85718","Ordinal":"1","NoteData":"The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 3.0.8 until 3.0.12, a client with maxConnections or maxConnectionsPerHost set above zero leaks one connection permit whenever TLS connection establishment fails before the handshake completes. NettyConnectListener removes the partitionKeyLock permit from NettyResponseFuture before every failure path is bound to the channel closeFuture, so an abort can leave the permit unreleased. Repeated failures can permanently lock out one host under a per-host limit or drain the shared pool under a global limit, blocking later requests even when no connection remains open. The default unlimited connection setting is not affected. This issue is fixed in version 3.0.12.","Type":"Description","Title":"AsyncHttpClient: Connection permit leak on TLS handshake failure"}]}}}