CVE-2026-111811CWE-306

CVE-2026-111811

Critical · published October 22, 2026

CVSS v3.1
9.0
EPSS
0%
Percentile
16.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
9.4 · 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
EPSS
0.00259 · 16.6th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-10-22T00:17Z
References (1)
https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc · [email protected]
EPSS history
Timeline
  • 23 OCT 03:55Z
    EPSS moved — → 0%
    epss
  • 21 OCT 19:17Z
    Apache Traffic Server: tsmemcache plugin exposes the shared proxy cache over the network with no authentication
    cvelistv5
  • 21 OCT 19:17Z
    Apache Traffic Server: tsmemcache plugin exposes the shared proxy cache over the network with no authentication
    cvelistv5