CVE-2026-111809 Apache Traffic Server - HTTP Request Smuggling

Apache Traffic Server 8.0.0 through 8.1.11, 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and 10.2.0 contains an HTTP request smuggling vulnerability caused by improper handling of HEAD requests with Content-Length or Transfer-Encoding headers, letting remote attackers smuggle requests, exploit requires crafted HEAD requests.

CVSS base score 9.3 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
HTTP Request Smuggling
Impact
HTTP Request Smuggling
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
Published
21 October 2026
Updated
22 October 2026
Weakness
CWE-444

Vendor fix

Upgrade to versions 9.2.16, 10.1.5, or 10.2.1.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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