CVE-2026-111814: CWE-295 Improper Certificate Validation in Apache Software Foundation Apache Traffic Server
Description
CVE-2026-111814 is a critical vulnerability in Apache Traffic Server affecting versions from 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and 10.2.0. The flaw involves improper certificate validation where the default outbound session-sharing policy can reuse a pooled TLS session authenticated with one client certificate for a transaction that should present a different client certificate. This issue is fixed in versions 9.2.16, 10.1.5, and 10.2.1.
CVSS v3.1
Score 10.0critical
Affected software
Apache Software Foundation
Apache Traffic Server
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Apache Traffic Server's default outbound session-sharing policy improperly reuses pooled TLS sessions authenticated with one client certificate for transactions configured to present different client certificates. This constitutes a CWE-295 (Improper Certificate Validation) vulnerability. It affects versions >=9.0.0 <=9.2.15, >=10.0.0 <=10.1.4, and =10.2.0. The vulnerability is addressed by upgrading to versions 9.2.16, 10.1.5, or 10.2.1.
Potential Impact
The vulnerability allows TLS sessions authenticated with one client certificate to be reused improperly for transactions that should present a different client certificate. This can lead to a breach of authentication boundaries, potentially allowing unauthorized access or impersonation in TLS client authentication scenarios. The CVSS v3.1 score is 10.0 (critical), indicating high impact on confidentiality and integrity without requiring privileges or user interaction.
Mitigation Recommendations
Users should upgrade Apache Traffic Server to versions 9.2.16, 10.1.5, or 10.2.1, which contain the official fix for this vulnerability. No other mitigation is specified or required once these versions are applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-10-16T20:23:50.515Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad912f44d27ba8daae7aa0f
Added to database: 10/21/2026, 19:31:00 UTC
Last enriched: 10/21/2026, 19:45:24 UTC
Last updated: 10/21/2026, 19:46:44 UTC
Views: 3
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