CVE-2026-111804: CWE-416 Use After Free in Apache Software Foundation Apache Traffic Server
Description
Apache Traffic Server versions 10.0.0 through 10.1.4 and 10.2.0 contain a use-after-free vulnerability in the experimental wasm plugin's transaction-close handler. This flaw also involves forwarding unvalidated guest-supplied metric IDs to the internal stats API. The issue is addressed in versions 10.1.5 and 10.2.1.
CVSS v3.1
Score 8.2high
Affected software
Apache Software Foundation
Apache Traffic Server
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-111804 describes a use-after-free vulnerability (CWE-416) in Apache Traffic Server's experimental wasm plugin, specifically in its transaction-close handler. Additionally, the plugin forwards unvalidated metric IDs supplied by guests to the internal stats API, which may contribute to the vulnerability. The affected versions are from 10.0.0 up to and including 10.1.4, and version 10.2.0. The vendor has fixed the issue in versions 10.1.5 and 10.2.1.
Potential Impact
The vulnerability has a CVSS 3.1 score of 8.2 (high severity) with network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality impact, low integrity impact, and high availability impact. This indicates that an attacker can remotely exploit the flaw to cause a denial of service or crash, impacting availability. There is no direct confidentiality impact reported.
Mitigation Recommendations
Users should upgrade Apache Traffic Server to versions 10.1.5 or 10.2.1, which contain official fixes for this vulnerability. No other mitigation is indicated or required according to the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-10-16T20:15:36.197Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad9050f4d27ba8daadca01e
Added to database: 10/21/2026, 18:31:43 UTC
Last enriched: 10/21/2026, 18:45:36 UTC
Last updated: 10/21/2026, 18:46:14 UTC
Views: 6
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