Origin Validation Error Affecting org.asynchttpclient:async-http-client package, versions [,2.14.5)[3.0.0.Beta1,3.0.9)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JAVA-ORGASYNCHTTPCLIENT-16032254
- published14 Apr 2026
- disclosed14 Apr 2026
- creditUnknown
Introduced: 14 Apr 2026
CVE-2026-40490 (opens in a new tab)How to fix?
Upgrade org.asynchttpclient:async-http-client to version 2.14.5, 3.0.9 or higher.
Overview
org.asynchttpclient:async-http-client is a maven plugin for the Async Http Client (AHC) classes.
Affected versions of this package are vulnerable to Origin Validation Error in the Redirect30xInterceptor class. An attacker in control of a cross-origin redirect target via a different exploit such as open redirect or DNS rebinding, or who is in a MitM position on HTTP connections, can leak Authorization and Proxy-Authorization headers. This is only exploitable if redirect following is enabled - i.e. followRedirect(true).
Workaround
This vulnerability can be avoided by setting followRedirect(false). Setting stripAuthorizationOnRedirect(true) only prevents this exploit if Realm-based authentication is NOT in use.