Medium
async-http-client — security advisory
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.
- Products
- async-http-client
- Affected versions
- 1.6.5-1, 1.6.5-2, 1.6.5-2ubuntu0.1~esm1, 1.6.5-4, 1.6.5-5, 2.12.2-1, 2.12.3-1, 2.12.3-1ubuntu0.22.04.1, 2.12.3-1ubuntu0.24.04.1, 2.12.3-1ubuntu1, 2.12.3-1ubuntu1.1, 2.6.0-1, 2.6.0-1ubuntu0.1~esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-85718
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:24 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-85718
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
Complete source record
{
"id": "a296646cd3b8aafd6727e62f5a88e4c2d6d277e6874860e28386758feea9c9e6",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-85718",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-85718",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-85718",
"products": [
{
"name": {
"value": "async-http-client",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.6.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.6.5-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.6.5-2ubuntu0.1~esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "async-http-client",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.6.5-4",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "async-http-client",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.6.5-4",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.5-5",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "async-http-client",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.6.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.6.0-1ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "async-http-client",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.12.2-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.12.3-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.12.3-1ubuntu0.22.04.1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "async-http-client",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.12.3-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.12.3-1ubuntu0.24.04.1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "async-http-client",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.12.3-1ubuntu1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "async-http-client",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.12.3-1",
"evidence": "/affected/7/versions"
},
{
"value": "2.12.3-1ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "2.12.3-1ubuntu1.1",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-85718",
"aliases": [
"UBUNTU-CVE-2026-85718"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "async-http-client",
"purl": "pkg:deb/ubuntu/async-http-client?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"1.6.5-1",
"1.6.5-2",
"1.6.5-2ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85718.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libasync-http-client-java",
"binary_version": "1.6.5-2ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "async-http-client",
"purl": "pkg:deb/ubuntu/async-http-client?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"1.6.5-4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85718.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libasync-http-client-java",
"binary_version": "1.6.5-4"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "async-http-client",
"purl": "pkg:deb/ubuntu/async-http-client?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1.6.5-4",
"1.6.5-5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85718.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libasync-http-client-java",
"binary_version": "1.6.5-5"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "async-http-client",
"purl": "pkg:deb/ubuntu/async-http-client?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"2.6.0-1",
"2.6.0-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85718.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libasync-http-client-java",
"binary_version": "2.6.0-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "async-http-client",
"purl": "pkg:deb/ubuntu/async-http-client?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"2.12.2-1",
"2.12.3-1",
"2.12.3-1ubuntu0.22.04.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85718.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libasync-http-client-java",
"binary_version": "2.12.3-1ubuntu0.22.04.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "async-http-client",
"purl": "pkg:deb/ubuntu/async-http-client?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"2.12.3-1",
"2.12.3-1ubuntu0.24.04.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85718.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libasync-http-client-java",
"binary_version": "2.12.3-1ubuntu0.24.04.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "async-http-client",
"purl": "pkg:deb/ubuntu/async-http-client?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"2.12.3-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85718.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libasync-http-client-java",
"binary_version": "2.12.3-1ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "async-http-client",
"purl": "pkg:deb/ubuntu/async-http-client?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"2.12.3-1",
"2.12.3-1ubuntu1",
"2.12.3-1ubuntu1.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85718.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libasync-http-client-java",
"binary_version": "2.12.3-1ubuntu1.1"
}
]
}
}
],
"modified": "2026-10-17T13:01:13.570348184Z",
"provider": "osv",
"upstream": [
"CVE-2026-85718"
],
"references": [
"https://ubuntu.com/security/CVE-2026-85718",
"https://www.cve.org/CVERecord?id=CVE-2026-85718",
"https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-gcmv-gr82-6m8v",
"https://github.com/AsyncHttpClient/async-http-client/issues/2189",
"https://github.com/AsyncHttpClient/async-http-client/pull/2288",
"https://github.com/AsyncHttpClient/async-http-client/commit/64eb57af52a003ae7f29a2f9f4502271bbb138dd"
]
},
"related_cves": [
{
"value": "CVE-2026-85718",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361307,
"published_at": "2026-09-17T16:18:00+00:00"
}