AsyncHttpClient async-http-client up to 2.14.x/3.0.9 Session Cookie Redirect30xInterceptor.java propagatedHeaders information disclosure

Summaryinfo

A vulnerability classified as problematic has been found in AsyncHttpClient async-http-client up to 2.14.x/3.0.9. This affects the function propagatedHeaders of the file Redirect30xInterceptor.java of the component Session Cookie Handler. Performing a manipulation results in information disclosure. This vulnerability is reported as CVE-2026-45300. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in AsyncHttpClient async-http-client up to 2.14.x/3.0.9. It has been classified as problematic. This affects the function propagatedHeaders of the file Redirect30xInterceptor.java of the component Session Cookie Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-45300 since 05/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 319606 (Linux Distros Unpatched Vulnerability : CVE-2026-45300), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.15.0 or 3.0.10 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (319606). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• AsyncHttpClient

Name

• async-http-client

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7
• 3.0.8
• 3.0.9

License

• open-source

Website

• Product: https://github.com/AsyncHttpClient/async-http-client/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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