http/2 parsing

About this tag
The http/2 parsing tag covers discussions about how HTTP/2 protocol parsing can introduce security vulnerabilities, particularly through normalization mistakes. A key example is CVE-2026-33186, a gRPC-Go authorization bypass caused by a missing leading slash in the HTTP/2 :path pseudo-header. This flaw allows requests to bypass policy logic that expects canonical gRPC paths to start with a slash. The issue highlights how small parsing errors in HTTP/2 can lead to significant security gaps, especially in enterprise and cloud environments where gRPC is used. Topics include protocol normalization, authorization bypass, and the importance of strict parsing in HTTP/2 implementations.

  1. CVE-2026-33186: gRPC-Go Authorization Bypass from Missing Leading Slash

    Microsoft’s CVE-2026-33186 entry for gRPC-Go points to an authorization bypass rooted in a deceptively small parsing flaw: a missing leading slash in the HTTP/2 :path pseudo-header. In practice, that means a request can slip past policy logic that assumes canonical gRPC paths always begin with...
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    • authorization bypass cve remediation grpc-go security http/2 parsing
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    • Forum: Security Alerts