Improper Authorization in grpc-go - CVE-2026-33186
Published: May 1, 2026
Vulnerability identifier: #VU128730
CSH Severity: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-33186
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
grpc-go
grpc-go
Software vendor:
grpc
grpc
Description
The vulnerability allows a remote attacker to gain access to bypass authorization.
The vulnerability exists due to authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. A remote attacker can send raw HTTP/2 frames with malformed `:path` headers directly to the gRPC server to bypass authorization.
Remediation
Install updates from vendor's website.