CVE-2026-111811 PUBLISHED

Apache Traffic Server: tsmemcache plugin exposes the shared proxy cache over the network with no authentication

Assigner: apache
Reserved: 16.10.2026 Published: 21.10.2026 Updated: 22.10.2026

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.

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 9

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:H
CVSS Score: 9.4

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	High	Availability	High
Privileges Required	None
User Interaction	None

CVSS 4.0

Vendor	Apache Software Foundation
Product	Apache Traffic Server
Versions	Default: unaffected affected from 8.0.0 to 8.1.11 (incl.) affected from 9.0.0 to 9.2.15 (incl.) affected from 10.0.0 to 10.1.4 (incl.) Version 10.2.0 is affected