CVE-2026-93567 HTTP Protocol - HTTP Request Smuggling

An HTTP/1 CONNECT request with authority-form is translated to a malformed HTTP/2 CONNECT request with a Host-controlled :authority header, allowing attackers to manipulate request routing or cause unexpected behavior.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
2.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
HTTP Request Smuggling
Impact
Denial Of Service, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-20

Vendor fix

Update to the latest version that properly handles HTTP/1 CONNECT translation to HTTP/2.

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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