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9.9

Apache Traffic Server cache can be accessed without authentication

CVE-2026-111811 · published 19 days ago
Summary

The tsmemcache add‑on in Apache Traffic Server lets anyone on the network read, change, or delete cached web content, because it does not require a login. This exposes shared proxy data and could let attackers tamper with or steal information. Upgrade to the latest release (9.2.16, 10.1.5, or 10.2.1) to close the gap.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
Ecosystem VendorProductAffected versions
– apache software foundation apache traffic server <= 8.1.11
Debian:12 debian trafficserver All versions
Ubuntu:16.04:LTS canonical trafficserver All versions
Original advisory text
Apache Traffic Server: tsmemcache plugin exposes the shared proxy cache over the network with no authentication
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.9 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-306Missing Authentication for Critical Function
Timeline
Published21 Oct 2026
Updated4 Nov 2026
First seen21 Oct 2026
Sources
CVE-2026-111811 · NVD
CVE-2026-111811 · MITRE
DEBIAN-CVE-2026-111811 · OSV
UBUNTU-CVE-2026-111811 · OSV
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