CVE-2026-107282 AsyncHttpClient CVE debrief

Who should care

Defenders and developers using AsyncHttpClient in Java applications should be aware of this vulnerability and take steps to update to fixed versions. They should review affected applications and systems to ensure they are updated and secure. Operators and security teams should prioritize updating to fixed versions (3.0.13 or 2.16.1) and review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

The AsyncHttpClient library has a critical vulnerability allowing cross-host request replay, potentially exposing sensitive information. Defenders should prioritize updating to fixed versions (3.0.13 or 2.16.1) and review affected applications.

• Potential exposure of sensitive information, including the original host's path, Host header, Authorization credentials, or plaintext request.
• Possible unauthorized access to sensitive data or systems.
• Need for defenders to update to fixed versions of AsyncHttpClient to prevent potential exposure.
• Verification of affected applications and systems to ensure they are updated and secure.

Technical summary

The AsyncHttpClient library has a vulnerability prior to versions 3.0.13 and 2.16.1, allowing for cross-host request replay and potential exposure of sensitive information, including the original host's path, Host header, Authorization credentials, or plaintext request. This issue can lead to unintended exposure of sensitive information when the request is replayed to a different host. Connection-pool selection, CONNECT handling, realm selection, and TLS setup can consequently send the original host's path, Host header, Authorization credentials, or plaintext request to the replay destination.

Defensive priority

Defenders should prioritize updating to fixed versions of AsyncHttpClient (3.0.13 or 2.16.1) to prevent potential exposure of sensitive information.

Recommended defensive actions

• Update to AsyncHttpClient version 3.0.13 or 2.16.1
• Review and update affected applications using AsyncHttpClient
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, affected versions, and fixed versions. However, there is limited information on potential exploitation or victim impact. Defenders should verify affected applications and systems to ensure they are updated and secure. The AsyncHttpClient library, used in Java applications for executing HTTP requests, has a critical vulnerability allowing cross-host request replay, potentially exposing sensitive information. Evidence from the CVE Program record and source item confirm

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.