EUVD-2026-81908Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable and unauthenticated on the client, but AC:H due to the pre-handshake TLS-failure race plus required non-default bounded-pool config; impact is availability-only (permit exhaustion), so C:N/I:N/A:H.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Connection-permit leakage in the AsyncHttpClient (AHC) Java library versions 3.0.8 through 3.0.11 can permanently exhaust a configured connection pool and deny service to subsequent HTTP requests. Applications are exposed only if they set maxConnections or maxConnectionsPerHost above zero; each TLS connection attempt that aborts before the handshake completes strands one permit, because NettyConnectListener removes the partitionKeyLock permit from NettyResponseFuture before every failure path is bound to the channel's closeFuture. …
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Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim application to configure AsyncHttpClient with maxConnections OR maxConnectionsPerHost set above zero - the default unlimited connection setting is explicitly NOT affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but conditional availability issue, not a top-tier priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade AsyncHttpClient to 3.0.12, the first release containing the permit-ownership fix, and rebuild or re-resolve the dependency so transitive users (for example frameworks that bundle async-http-client) pick up 3.0.12 as well; the fix is also visible as the upstream commit 64eb57af52a003ae7f29a2f9f4502271bbb138dd and PR 2288, and the vendor advisory is https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-gcmv-gr82-6m8v. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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