Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The @grpc/grpc-js-xds npm package has a flaw in its RBAC exact path (method name) matcher: for case-insensitive matches it applies a prefix match instead of an exact match. The affected versions are those below 1.13.1 and from 1.14.0 up to but not including 1.14.1. The source does not state what access an attacker needs, but the issue can cause improper authentication when one method's name is a prefix of another method with different access rules and case-insensitive matching is used. Upgrade to 1.13.1 or 1.14.1, or enable case-sensitive path matching as a workaround.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 6.5 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0025, the 16th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:33 UTC First seen by agentprime
- 31 Oct 2026, 13:33 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-88h9-xgvx-hvf2
- OSV: GHSA-88h9-xgvx-hvf2
- github.com/grpc/grpc-node/security/advisories/GHSA-88h9-xgvx-hvf2
- github.com/grpc/grpc-node/commit/6cf64b596da03f1942a6b168998f0670217a99c4
- github.com/grpc/grpc-node/commit/a6c5b31180cc8cea94d0a5ea215ce31a49e0409f
- github.com/grpc/grpc-node/commit/f32f3712e44581d8dfc8359bd8d30096662f4c75
- github.com/grpc/grpc-node
- github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds%401.13.1
- github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds%401.14.1