CVE-2026-111805CWE-400denial-of-service

CVE-2026-111805

High · published October 22, 2026

CVSS v3.1
8.6
EPSS
0%
Percentile
24.2
In the wild
Unconfirmed
What it is

Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a truncated HTTP/2 Content-Length value.

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
8.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS v4.0
7.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H
EPSS
0.00324 · 24.2th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
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 19:10Z
    Apache Traffic Server: HTTP/2 Content-Length truncation lets a client trigger backend worker-pool exhaustion
    cvelistv5
  • 21 OCT 19:10Z
    Apache Traffic Server: HTTP/2 Content-Length truncation lets a client trigger backend worker-pool exhaustion
    cvelistv5