CVE-2026-107232 AsyncHttpClient: Origin credentials sent in cleartext to a proxy that rejects the CONNECT
Attackers can intercept cleartext origin credentials sent to a proxy after a rejected CONNECT request, exposing sensitive authentication data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-107232?
CVE-2026-107232 is a high-severity vulnerability in AsyncHttpClient async-http-client, published on 7 Oct 2026. An attacker can exploit it over the internet without logging in, 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 3.0.12 on 3.x and 2.16.1 on 2.x, the client infers that an HTTP proxy tunnel exists from the last request method rather than the CONNECT result. After a proxy rejects CONNECT, redirect or authentication handlers can write an origin request and its Authorization credentials onto the still-plaintext proxy connection. Basic credentials can be recovered directly, while NTLM responses may be cracked or relayed. This issue is fixed in versions 3.0.12 and 2.16.1.
Which versions are affected by CVE-2026-107232?
How do I fix CVE-2026-107232?
No fix has been published for CVE-2026-107232 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-107232 being exploited?
There is no known exploitation of CVE-2026-107232 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-107232, GHSA-v9f2-7rw2-gr2x, UBUNTU-CVE-2026-107232.