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

{
  "id": "9334f1ca43ea69ca8993cf39563ad02fad625941a1b3c9d392fcaf11622ddaa4",
  "url": "https://osv.dev/vulnerability/GHSA-88h9-xgvx-hvf2",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "@grpc/grpc-js: The exact path match matcher incorrectly only applies a prefix match for case-insensitive matches",
    "summary": "### 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.",
    "evidence": "osv:GHSA-88h9-xgvx-hvf2",
    "products": [
      {
        "name": {
          "value": "@grpc/grpc-js-xds",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.13.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "@grpc/grpc-js-xds",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.14.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "1.14.0",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "GHSA-88h9-xgvx-hvf2",
      "aliases": [
        "CVE-2026-101914",
        "GHSA-88h9-xgvx-hvf2"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.13.1"
                }
              ]
            }
          ],
          "package": {
            "name": "@grpc/grpc-js-xds",
            "purl": "pkg:npm/%40grpc/grpc-js-xds",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-88h9-xgvx-hvf2/GHSA-88h9-xgvx-hvf2.json"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "1.14.0"
                },
                {
                  "fixed": "1.14.1"
                }
              ]
            }
          ],
          "package": {
            "name": "@grpc/grpc-js-xds",
            "purl": "pkg:npm/%40grpc/grpc-js-xds",
            "ecosystem": "npm"
          },
          "versions": [
            "1.14.0"
          ],
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-88h9-xgvx-hvf2/GHSA-88h9-xgvx-hvf2.json"
          }
        }
      ],
      "modified": "2026-10-14T05:15:05.742465218Z",
      "provider": "osv",
      "references": [
        "https://github.com/grpc/grpc-node/security/advisories/GHSA-88h9-xgvx-hvf2",
        "https://github.com/grpc/grpc-node/commit/6cf64b596da03f1942a6b168998f0670217a99c4",
        "https://github.com/grpc/grpc-node/commit/a6c5b31180cc8cea94d0a5ea215ce31a49e0409f",
        "https://github.com/grpc/grpc-node/commit/f32f3712e44581d8dfc8359bd8d30096662f4c75",
        "https://github.com/grpc/grpc-node",
        "https://github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds%401.13.1",
        "https://github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds%401.14.1"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-187",
          "CWE-863"
        ],
        "severity": "MODERATE",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-09-28T19:43:51Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-101914",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 315270,
  "published_at": "2026-09-28T19:43:51+00:00"
}