Vulnerability · Published Oct 7, 2026 · Assigned by GitHub_M
CVE-2026-107231AsyncHttpClient: Digest challenge without a usable nonce downgrades to Basic and sends the password in cleartext
High 8.7
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 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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, 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | async-http-client | no fix listed | DEBIAN-CVE-2026-107231 |
| Maven | org.asynchttpclient:async-http-client | 3.0.13 | GHSA-rqf5-2wxv-rjf4 |
| Maven | org.asynchttpclient:async-http-client | 2.16.1 | GHSA-rqf5-2wxv-rjf4 |
| Ubuntu:22.04:LTS | async-http-client | no fix listed | UBUNTU-CVE-2026-107231 |
| Ubuntu:24.04:LTS | async-http-client | no fix listed | UBUNTU-CVE-2026-107231 |
| Ubuntu:26.04:LTS | async-http-client | no fix listed | UBUNTU-CVE-2026-107231 |
| Ubuntu:26.10 | async-http-client | no fix listed | UBUNTU-CVE-2026-107231 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AsyncHttpClient | async-http-client | >= 3.0.0.Beta1, < 3.0.13>= 2.0.0, < 2.16.1 |
Weakness: CWE-319, CWE-522, CWE-757 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rqf5-2wxv-rjf4 x_refsource_CONFIRM
- 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 x_refsource_MISC