CVE-2026-111812 Apache Traffic Server - Authentication Bypass

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 authentication bypass caused by origin_server_auth plugin allowing clients to force signing of attacker-chosen AWS request headers under proxy credentials, letting attackers impersonate the proxy, exploit requires crafted AWS request headers.

CVSS base score 10.0 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Published
21 October 2026
Updated
22 October 2026
Weakness
CWE-863

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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