Medium severity · published Oct 7, 2026
CVE-2026-107285
AsyncHttpClient: WebSocket proxy credentials sent to the origin server over a CONNECT tunnel
5.9
CVSS
0.2%
EPSS
No
On KEV
Description
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, a proxied ws request is carried through CONNECT, but NettyRequestFactory.newNettyRequest and requestUri decide whether to attach proxy authentication and an absolute-form target only from whether the URI is secure. Because ws is not marked secure, the tunneled WebSocket upgrade sent to the origin includes the proxy's Proxy-Authorization value. Basic credentials are directly recoverable and Digest responses can be replayed or cracked offline. This issue is fixed in versions 3.0.12 and 2.16.1.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
async-http-client · AsyncHttpClient
>= 3.0.0, <3.0.12; >= 2.0.0, < 2.16.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107285
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107285
x_refsource_CONFIRM
https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-3wp9-xfwm-rjjf
x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/commit/6e9cb75a9b7259353f983fc90ca28b1da3742e18
x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/commit/c4feab0f7f86d61505a48e40d383c8a375a22e18
x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1
x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12
More from async-http-client
9.4
CVE-2026-107282
AsyncHttpClient: Replay to a different host sends the original host request and credentials to the new host
8.8
CVE-2026-107279
AsyncHttpClient: Digest mutual authentication is switched off by a peer offering qop=auth-int
8.7
CVE-2026-107231
AsyncHttpClient: Digest challenge without a usable nonce downgrades to Basic and sends the password in cleartext
7.6
CVE-2026-107281
AsyncHttpClient: Connection pool key omits the authenticated principal, so an NTLM or Negotiate connection is reused across identities
7.5
CVE-2026-107232
AsyncHttpClient: Origin credentials sent in cleartext to a proxy that rejects the CONNECT