9.4

CVE-2026-111811: Apache Traffic Server: tsmemcache plugin exposes the shared proxy cache over the network with no authentication

Awaiting analysis
AliasesDEBIAN-CVE-2026-111811UBUNTU-CVE-2026-111811
Published 21-10-2026Last modified 23-10-2026

Vulnerability summary

CVE-2026-111811 is a critical (CVSS 9.4) vulnerability in apache software foundation apache traffic server. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 29.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.4 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.4/10
010
Critical · v4.0 (CVE.org)
EPSS score
0.36%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 21-10-2026
    PublishedVulnerability first disclosed.
  2. 23-10-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.36%

Chance of exploitation in the next 30 days

Percentile

29%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

22-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Apache software foundation1 product
Debian1 product
  • trafficserverAll versions (No fix recorded)
Ubuntu1 product
  • trafficserverAll versions (No fix recorded)

3 vendors · 3 products

References

5 links