---
id: CVE-2026-111814
title: >-
  Apache Traffic Server: Default server_session_sharing.match omits MASK_CERT,
  allowing pooled mTLS identity confusion at the origin
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.




  This issue affects Apache Traffic Server…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-295
vendor: Apache Software Foundation
product: Apache Traffic Server
affected:
  - apache_traffic_server >= 9.0.0 <= 9.2.15
  - apache_traffic_server >= 10.0.0 <= 10.1.4
  - apache_traffic_server 10.2.0
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T19:13:06.888Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111814'
references:
  - url: 'https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc'
tags:
  - cve.org
ingestedAt: '2026-10-21T20:11:44.910Z'
---

## Overview

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.



This issue affects Apache Traffic Server: from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.



Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.

## Affected

- `apache_traffic_server >= 9.0.0 <= 9.2.15`
- `apache_traffic_server >= 10.0.0 <= 10.1.4`
- `apache_traffic_server 10.2.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.