CVE-2026-111809

CRITICAL 9.3CVE-2026-111809 · Published 21/10/2026 · updated 28/10/2026

In short

CVE-2026-111809 is a CRITICAL (CVSS 9.3) vulnerability.
Chance of exploitation in the next 30 days (EPSS): 0.22%, higher than 12.4% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
—	No affected product versions are listed for this vulnerability yet.

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.

References

lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc

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