CVE-2026-111814 Apache Software Foundation CVE debrief

Who should care

Defenders managing Apache Traffic Server deployments should assess exposure and prioritize upgrades to mitigate the mTLS identity confusion vulnerability. This involves verifying session sharing policies, assessing potential impacts on mutual TLS authentication, and ensuring that the system is upgraded to a fixed version. Security teams should also monitor for potential attacks and review compensating controls for exposed systems.

Why it matters

Defenders should prioritize upgrading Apache Traffic Server to mitigate the mTLS identity confusion vulnerability, verify session sharing policies, and assess potential impacts on mutual TLS authentication.

• Potential mTLS identity confusion at the origin
• Need to verify and adjust session sharing policies
• Possible impact on mutual TLS authentication

Technical summary

Apache Traffic Server's default outbound session-sharing policy can reuse a pooled TLS session authenticated with one client certificate for a transaction configured to present a different one, allowing mTLS identity confusion at the origin. This issue affects Apache Traffic Server versions 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and 10.2.0. The vulnerability impacts mutual TLS authentication and requires verification of session sharing policies to mitigate potential attacks. Defenders should prioritize upgrading to version 9.2.16, 10.1.5, or 10.2.1.

Defensive priority

Defenders should prioritize upgrading Apache Traffic Server to version 9.2.16, 10.1.5, or 10.2.1 to mitigate the mTLS identity confusion vulnerability.

Recommended defensive actions

• Upgrade Apache Traffic Server to version 9.2.16, 10.1.5, or 10.2.1
• Review and adjust session sharing policies according to specific deployment needs
• Monitor for potential mTLS identity confusion attacks
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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

Evidence notes

The CVE record and source item provide details on the vulnerability in Apache Traffic Server, including affected versions and recommended upgrades. Evidence is limited to publicly available information from these sources. Defenders should verify the specific versions and configurations of Apache Traffic Server in their environments to assess exposure. The CVE record was published on 2026-10-21T19:13:06.888Z and has not been modified since then.

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.