AsyncHttpClient: WebSocket proxy credentials sent to the origin server over a CONNECT tunnel

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.9 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

• CVE-2026-107285: 0.21% estimated exploitation activity in the next 30 days; percentile 10.67 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact When a ws:// request is routed through an HTTP proxy with proxy authentication configured, the client tunnels the connection with an HTTP CONNECT, the same as it does for https://. Once the tunnel is open, the WebSocket upgrade request that follows is sent through the tunnel directly to the origin server, not to the proxy. The proxy-auth gate and the companion request-target selection keyed only on whether the URI was secured, which is false for ws://, so the tunnelled upgrade request incorrectly carried the proxy's Proxy-Authorization header and an absolute-form request target meant for the proxy. Any origin server reached over a proxied ws:// connection, or anyone positioned on the origin side of the wire, could recover the proxy credentials: directly for Basic, or as a replayable and offline-crackable response for Digest. Affected versions 3.x: up to and including 3.0.11 2.x: up to and including 2.16.0 Patches Fixed in 3.0.12 on the 3.x line and in 2.16.1 on the 2.x line.…

Published by the source

8 Oct 2026, 16:30 UTC

Last modified by the source

8 Oct 2026, 16:45 UTC

Source last checked

26 Oct 2026, 16:58 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-3wp9-xfwm-rjjf

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-3wp9-xfwm-rjjf

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# Patch Next advisory brief: CVE-2026-107285

Advisory: AsyncHttpClient: WebSocket proxy credentials sent to the origin server over a CONNECT tunnel
IDs: CVE-2026-107285, GHSA-3wp9-xfwm-rjjf
Record: https://patchnext.com/advisories/cve-2026-107285 (revision 2, source checked 26 Oct 2026, 16:58 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.asynchttpclient:async-http-client 3.0.12, 2.16.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.asynchttpclient:async-http-client: affected >= 3.0.0, <= 3.0.11; >= 2.0.0, <= 2.16.0; fixed in 2.16.1, 3.0.12

## Suggested inspection (read-only)
- Maven org.asynchttpclient:async-http-client: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.asynchttpclient:async-http-client.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-3wp9-xfwm-rjjf (OSV record GHSA-3wp9-xfwm-rjjf lists affected ranges: Maven org.asynchttpclient:async-http-client >=3.0.0 =2.0.0 <2.16.1 (fixed))
- Verified: https://github.com/advisories/GHSA-3wp9-xfwm-rjjf (GitHub-reviewed advisory GHSA-3wp9-xfwm-rjjf lists affected ranges: Maven org.asynchttpclient:async-http-client >=3.0.0 =2.0.0 <=2.16.0)

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