CVE-2026-45300
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses.
Impact
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Versions on the 2.x branch prior to 2.15.0 and the 3.x branch prior to 3.0.10 leak `Cookie` headers to cross-origin redirect targets. When following a redirect to a different origin, the `propagatedHeaders()` method in `Redirect30xInterceptor.java` strips `Authorization` and `Proxy-Authorization` headers but does not strip the `Cookie` header, causing session cookies and other sensitive cookie values to be sent to attacker-controlled servers. Versions 2.15.0 and 3.0.10 patch the issue.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | org.asynchttpclient:async-http-client | >= 3.0.0.Beta1, < 3.0.10 | 3.0.10 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Asynchttpclient Project | Async-Http-Client | from 2.0.0 before 2.15.0 from 3.0.0 before 3.0.10 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fmxf-pm6p-7xgm
- https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-fmxf-pm6p-7xgm
- https://github.com/AsyncHttpClient/async-http-client/commit/3b0e3e9e
- https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.10
- https://nvd.nist.gov/vuln/detail/CVE-2026-45300