CVSS 3.1
7.4 highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:NCVE-2026-45300
High (7.4) in asynchttpclient project async-http-client. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in org.asynchttpclient:async-http-client 2.15.0, 3.0.10.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 34% of CVEs (scores of 2026-10-31)
- CWE
- CWE-200
- Published
- Modified
- Record from
- the NVD, synced
Affected
- asynchttpclient_project:async-http-client
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-fmxf-pm6p-7xgm | Maven | org.asynchttpclient:async-http-client | >=3.0.0.Beta1 <3.0.10 | 3.0.10 |
| GHSA-fmxf-pm6p-7xgm | Maven | org.asynchttpclient:async-http-client | >=2.0.0 <2.15.0 | 2.15.0 |
References
- 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://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-fmxf-pm6p-7xgm
- https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-fmxf-pm6p-7xgm