CVE-2026-111816 Apache Traffic Server - HTTP Request Smuggling

Apache Traffic Server 8.0.0 to 8.1.11, 9.0.0 to 9.2.15, 10.0.0 to 10.1.4, and 10.2.0 contains a cache poisoning and response-framing desync vulnerability caused by malformed 302 response with Transfer-Encoding: chunked bypassing parse error rejection, letting attackers poison cache, exploit requires sending malformed HTTP responses.

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
Data Tampering
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 or later.

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

← All CVEs