Vulnerability-Lookup

GHSA-88H9-XGVX-HVF2

Vulnerability from github – Published: 2026-09-28 19:43 – Updated: 2026-09-28 19:43

Summary

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

Details

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.

Severity

6.5 (Medium)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@grpc/grpc-js-xds"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.13.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@grpc/grpc-js-xds"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.14.0"
            },
            {
              "fixed": "1.14.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.14.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-101914"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-187",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-28T19:43:51Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nWhen 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.\n\n### Patches\n\nThis vulnerability is fixed in 1.13.1 and 1.14.1.\n\n### Workarounds\nThis problem can be avoided by enabling case-sensitive path matching.",
  "id": "GHSA-88h9-xgvx-hvf2",
  "modified": "2026-09-28T19:43:51Z",
  "published": "2026-09-28T19:43:51Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc-node/security/advisories/GHSA-88h9-xgvx-hvf2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc-node/commit/6cf64b596da03f1942a6b168998f0670217a99c4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc-node/commit/a6c5b31180cc8cea94d0a5ea215ce31a49e0409f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc-node/commit/f32f3712e44581d8dfc8359bd8d30096662f4c75"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/grpc/grpc-node"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds/1.13.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds/1.14.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@grpc/grpc-js: The exact path match matcher incorrectly only applies a prefix match for case-insensitive matches"
}

CVE-2026-101914 (GCVE-0-2026-101914)

Vulnerability from cvelistv5 – Published: 2026-09-28 19:36 – Updated: 2026-09-28 19:46

Title

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

Summary

@grpc/grpc-js implements the core functionality of gRPC purely in JavaScript, without a C++ addon. Prior to 1.13.1 and 1.14.1, the exact path (method name) matcher used by RBAC performs a prefix comparison instead of an equality comparison when case-insensitive matching is enabled. If one service method name prefixes another and the methods have different access rules, a request for the longer method can match the shorter method's rule and cause incorrect authorization. This issue is fixed in versions 1.13.1 and 1.14.1.

Severity

6.5 (Medium)


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

CWE

CWE-187 - Partial String Comparison
CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

6 references

URL	Tags
https://github.com/grpc/grpc-node/security/adviso…	x_refsource_CONFIRM
https://github.com/grpc/grpc-node/commit/6cf64b59…	x_refsource_MISC
https://github.com/grpc/grpc-node/commit/a6c5b311…	x_refsource_MISC
https://github.com/grpc/grpc-node/commit/f32f3712…	x_refsource_MISC
https://github.com/grpc/grpc-node/releases/tag/@g…	x_refsource_MISC
https://github.com/grpc/grpc-node/releases/tag/@g…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
grpc	grpc-node	Affected: < 1.13.1 Affected: >= 1.14.0, < 1.14.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "grpc-node",
          "vendor": "grpc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.13.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.14.0, \u003c 1.14.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "@grpc/grpc-js implements the core functionality of gRPC purely in JavaScript, without a C++ addon. Prior to 1.13.1 and 1.14.1, the exact path (method name) matcher used by RBAC performs a prefix comparison instead of an equality comparison when case-insensitive matching is enabled. If one service method name prefixes another and the methods have different access rules, a request for the longer method can match the shorter method\u0027s rule and cause incorrect authorization. This issue is fixed in versions 1.13.1 and 1.14.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-187",
              "description": "CWE-187: Partial String Comparison",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-28T19:46:53.330Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/grpc/grpc-node/security/advisories/GHSA-88h9-xgvx-hvf2",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/grpc/grpc-node/security/advisories/GHSA-88h9-xgvx-hvf2"
        },
        {
          "name": "https://github.com/grpc/grpc-node/commit/6cf64b596da03f1942a6b168998f0670217a99c4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-node/commit/6cf64b596da03f1942a6b168998f0670217a99c4"
        },
        {
          "name": "https://github.com/grpc/grpc-node/commit/a6c5b31180cc8cea94d0a5ea215ce31a49e0409f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-node/commit/a6c5b31180cc8cea94d0a5ea215ce31a49e0409f"
        },
        {
          "name": "https://github.com/grpc/grpc-node/commit/f32f3712e44581d8dfc8359bd8d30096662f4c75",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-node/commit/f32f3712e44581d8dfc8359bd8d30096662f4c75"
        },
        {
          "name": "https://github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds%401.13.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds%401.13.1"
        },
        {
          "name": "https://github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds%401.14.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-node/releases/tag/@grpc/grpc-js-xds%401.14.1"
        }
      ],
      "source": {
        "advisory": "GHSA-88h9-xgvx-hvf2",
        "discovery": "UNKNOWN"
      },
      "title": "@grpc/grpc-js: The exact path match matcher incorrectly only applies a prefix match for case-insensitive matches"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-101914",
    "datePublished": "2026-09-28T19:36:55.746Z",
    "dateReserved": "2026-09-28T15:55:37.907Z",
    "dateUpdated": "2026-09-28T19:46:53.330Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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