@grpc/grpc-js: The exact path match matcher incorrectly only applies a prefix match for case-insensitive matches

### Impact When using RBAC to apply authentication rules, the exact path (method name) matcher applies a prefix match instead of an exact match for case-insensitive matches. As a result, if a service has a method with a name that is a prefix of the name of a different method, and they have different access rules, and case-insensitive matching is used, this bug can cause improper authentication. ### Patches This vulnerability is fixed in 1.13.1 and 1.14.1. ### Workarounds This problem can be avoided by enabling case-sensitive path matching.

Source published

28 Sep 2026 19:43:51 UTC

Source modified

14 Oct 2026 05:15:05 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

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