CVE-2026-111812 Apache Software Foundation CVE debrief

Who should care

Administrators and users of Apache Traffic Server, particularly those using versions 8.0.0 through 8.1.11, 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and 10.2.0, should be aware of the critical vulnerability in the origin_server_auth plugin. They should review official advisories, assess their exposure, and plan upgrades to patched versions. Security teams and vulnerability management teams should prioritize this issue and coordinate with affected teams.

Why it matters

The vulnerability in Apache Traffic Server's origin_server_auth plugin poses a critical risk, allowing clients to manipulate AWS request headers, potentially leading to unauthorized access, privilege escalation, and data compromise. Affected users should prioritize upgrading to patched versions to mitigate these risks.

• Potential unauthorized access to AWS resources
• Possible elevation of privileges
• Risk of data tampering or exposure

Technical summary

The origin_server_auth plugin in Apache Traffic Server allows clients to force signing of attacker-chosen AWS request headers under the proxy's own credentials. This issue affects multiple versions of Apache Traffic Server, including 8.0.0 through 8.1.11, 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and 10.2.0. The vulnerability poses a critical risk, allowing clients to manipulate AWS request headers, potentially leading to unauthorized access, privilege escalation, and data compromise. Affected users should prioritize upgrading to patched versions to mitigate these risks.

Defensive priority

High priority for upgrading to patched versions

Recommended defensive actions

• Upgrade to version 9.2.16, 10.1.5, or 10.2.1
• Review and update affected versions
• Monitor for potential exploitation attempts
• 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, affected versions, and recommended upgrades. Evidence limits suggest verifying affected scope and vendor guidance. Defenders should review official advisories and track exceptions for exposed assets. Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

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.