High severity · published Oct 7, 2026
CVE-2026-107231
AsyncHttpClient: Digest challenge without a usable nonce downgrades to Basic and sends the password in cleartext
8.7
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 3.0.13 and 2.16.1, Realm.Builder treats a Digest challenge that yields no usable nonce as a Basic challenge. A malicious origin or proxy can label a challenge Digest while omitting or emptying the nonce, causing the client to resend the username and password using reversible Basic authentication. Both origin and proxy challenge parsers are affected. This issue is fixed in versions 3.0.13 and 2.16.1.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% 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.Beta1, < 3.0.13; >= 2.0.0, < 2.16.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107231
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107231
x_refsource_CONFIRM
https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rqf5-2wxv-rjf4
x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/commit/8376866aa9b5a7653ad19db9d472692f875caa83
x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/commit/c8d639bf6ac341d377d610a93570bcd15565f1a6
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-3.0.13
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
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
7.5
CVE-2026-107227
AsyncHttpClient: Unbounded WebSocket permessage-deflate decompression enables a decompression-bomb denial of service when compression is enabled