CVE-2026-107279 AsyncHttpClient CVE debrief

Who should care

Defenders and developers using AsyncHttpClient version 3.0.12, especially those relying on Digest authentication for secure communication, should assess exposure and prioritize upgrading to version 3.0.13.

Why it matters

CVE-2026-107279 allows potentially unauthenticated server access in AsyncHttpClient 3.0.12 when a peer offers Digest qop=auth-int. Defenders should verify and upgrade to version 3.0.13, review affected systems, and monitor for unusual authentication attempts.

• Potential unauthorized server access due to skipped mutual authentication
• Possible authentication bypass in systems relying on Digest authentication
• Need for verification of server authenticity in affected deployments
• Priority on upgrading to AsyncHttpClient version 3.0.13

Technical summary

In AsyncHttpClient 3.0.12, a peer offering only Digest qop=auth-int causes mutual-authentication verification to be skipped. This is due to AuthenticatorUtils.computeExpectedRspAuth returning no expected value for auth-int, and Interceptors treating that result as unverifiable but nonfatal. As a result, a response with an invalid rspauth value is accepted, allowing a peer that does not know the shared secret to be accepted as the authenticated server.

Defensive priority

Defenders should prioritize verifying and upgrading to AsyncHttpClient version 3.0.13 if using 3.0.12, especially in systems relying on Digest authentication for secure communication.

Recommended defensive actions

• Verify and upgrade to AsyncHttpClient version 3.0.13 if using 3.0.12
• Review systems relying on Digest authentication for secure communication
• Monitor for unusual authentication attempts or server responses
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the vulnerability, its impact, and the fix in version 3.0.13. However, specific details about affected deployments or active exploitation are not provided.

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.