Improper Handling of Case Sensitivity in grpc-go - #VU144263
Published: August 19, 2026
Vulnerability identifier: #VU144263
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-178
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass header validation restrictions.
The vulnerability exists due to improper handling of case sensitivity in the gRFC A41 header matcher validation logic when validating grpc-prefixed header matchers. A remote attacker can use alternate header casing to bypass header validation restrictions.
The protection intended to reject configuration schemas using grpc-prefixed headers can be evaded with case variations such as Grpc-Status.
Affected software
grpc-go
Remediation
Install security update from vendor's website.
grpc-go - update to 1.83.1