CVE-2026-111804 Apache Software Foundation CVE debrief

Who should care

Defenders responsible for Apache Traffic Server deployments should assess exposure and prioritize upgrading to version 10.1.5 or 10.2.1. Inventory checks are necessary to verify exposure. Defenders should also review official advisories for affected scope and severity, and monitor for potential exploitation attempts.

Why it matters

Defenders should prioritize upgrading to version 10.1.5 or 10.2.1 due to potential denial of service and elevation of privileges. Inventory checks are necessary to verify exposure.

• Potential denial of service due to use-after-free vulnerability
• Possible elevation of privileges through unvalidated metric IDs
• Need for inventory checks to verify exposure
• Priority on upgrading to fixed versions

Technical summary

Apache Traffic Server's experimental wasm plugin has a use-after-free in its transaction-close handler and forwards unvalidated guest-supplied metric IDs to the internal stats API. This issue affects Apache Traffic Server: from 10.0.0 through 10.1.4, 10.2.0. The vulnerability could lead to potential denial of service and elevation of privileges. Defenders should assess exposure and prioritize upgrading to fixed versions. The issue requires inventory checks to verify exposure and review of official advisories for affected scope and severity.

Defensive priority

Defenders should prioritize upgrading to version 10.1.5 or 10.2.1. Inventory checks are necessary to verify exposure.

Recommended defensive actions

• Upgrade to version 10.1.5 or 10.2.1
• Perform inventory checks to verify exposure
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• 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. However, limited information is available on potential exploitation or victim impact. Defenders should verify exposure and review official advisories for affected scope and severity. Inventory checks are necessary to confirm affected deployments. Monitoring for potential exploitation attempts is also recommended.

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.