CVE-2026-45300

async-http-client: Cookie header not stripped on cross-origin redirect

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

AsyncHttpClient · async-http-client

CVSS v3.1 GITHUB

7.4 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

EPSS

0.46% chance of exploitation in the next 30 days, 39th percentile

Published

2026-06-05

Updated

2026-06-08

Proof-of-concept exploits (1)

• advisories/GHSA-fmxf-pm6p-7xgm

Security advisories

• AsyncHttpClient/async-http-client/security/advisories/GHSA-fmxf-pm6p-7xgm
• AsyncHttpClient/async-http-client/commit/3b0e3e9e

References

• CVE Record
• NVD entry