---
id: CVE-2026-111811
title: >-
  Apache Traffic Server: tsmemcache plugin exposes the shared proxy cache over
  the network with no authentication
summary: >-
  Apache Traffic Server's experimental tsmemcache plugin allows unauthenticated
  network read, write, and deletion of the shared proxy cache.




  This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from
  9.0.0 through 9.2.15,…
severity: critical
cvss: 9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-306
vendor: Apache Software Foundation
product: Apache Traffic Server
affected:
  - apache_traffic_server >= 8.0.0 <= 8.1.11
  - 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: '2026-10-21T19:17:32.448Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111811'
references:
  - url: 'https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc'
tags:
  - cve.org
ingestedAt: '2026-10-21T20:11:44.908Z'
---

## Overview

Apache Traffic Server's experimental tsmemcache plugin allows unauthenticated network read, write, and deletion of the shared proxy cache.



This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, 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 >= 8.0.0 <= 8.1.11`
- `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.