Log in Start free

Vulnerability · Published Oct 7, 2026 · Assigned by GitHub_M

CVE-2026-107232AsyncHttpClient: Origin credentials sent in cleartext to a proxy that rejects the CONNECT

High 7.5

In plain English

A high-severity security flaw in async-http-client from AsyncHttpClient. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.2%top 88.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12async-http-clientno fix listedDEBIAN-CVE-2026-107232
Ubuntu:22.04:LTSasync-http-clientno fix listedUBUNTU-CVE-2026-107232
Ubuntu:24.04:LTSasync-http-clientno fix listedUBUNTU-CVE-2026-107232
Ubuntu:26.04:LTSasync-http-clientno fix listedUBUNTU-CVE-2026-107232
Ubuntu:26.10async-http-clientno fix listedUBUNTU-CVE-2026-107232

Affected products (as reported)

VendorProductVersions
AsyncHttpClient async-http-client >= 3.0.0, < 3.0.12>= 2.0.0, < 2.16.1

Weakness: CWE-319, CWE-441, CWE-522 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References