CVE-2026-107281 Auth bypass in async-http-client
Attackers can reuse NTLM/Negotiate connections across identities, causing requests to execute as a different user, leading to privilege escalation or data exposure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-107281?
CVE-2026-107281 is a high-severity authentication bypass vulnerability in AsyncHttpClient async-http-client, published on 7 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, the HTTP/1.1 connection-pool key excludes the authenticated principal for connection-oriented NTLM and Negotiate authentication. A pooled socket authenticated for one request can be reused by a request carrying another principal, and the server executes that later request as the first identity. Basic and Digest are not affected because they authenticate each request. This issue is fixed in versions 3.0.13 and 2.16.1.
Which versions are affected by CVE-2026-107281?
How do I fix CVE-2026-107281?
No fix has been published for CVE-2026-107281 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-107281 being exploited?
There is no known exploitation of CVE-2026-107281 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-107281, GHSA-vvp4-63h8-v5pm, UBUNTU-CVE-2026-107281.