CVE-2026-111809 Apache Traffic Server: HEAD requests carrying Content-Length or Transfer-Encoding enable request smuggling
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-111809?
CVE-2026-111809 is a medium-severity vulnerability in Apache Traffic Server, published on 21 Oct 2026.
Official description
Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encoding.
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.
Weakness: CWE-444
Which versions are affected by CVE-2026-111809?
How do I fix CVE-2026-111809?
No fix has been published for CVE-2026-111809 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-111809 being exploited?
There is no known exploitation of CVE-2026-111809 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-111809, GHSA-hwgh-j4gj-qv24, UBUNTU-CVE-2026-111809.