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CVE-2026-84445 (GCVE-0-2026-84445)

Vulnerability from cvelistv5 – Published: 2026-09-14 16:11 – Updated: 2026-09-14 16:11
VLAI
Title
gRPC-Go: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in the xDS servers
Summary
gRPC-Go is the Go language implementation of gRPC. Prior to 1.82.2 and 1.83.2, servers created with xds.NewGRPCServer() allow internal/transport/http2_server.go to accept an RPC containing neither the :authority header nor the Host header, while RouteAndProcess in internal/xds/server/routing.go assumes that an authority value exists and indexes the empty slice. A remote client that can complete transport connection establishment can trigger an index-out-of-bounds panic that is not recovered by the per-RPC goroutine and terminates the entire server process. In insecure or ordinary TLS deployments the request can be unauthenticated, while strict mTLS or ALTS deployments require valid transport credentials before the malformed RPC can reach the interceptor. This issue is fixed in versions 1.82.2 and 1.83.2.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-129 - Improper Validation of Array Index
  • CWE-248 - Uncaught Exception
Assigner
References
Impacted products
Vendor Product Version CPE status
grpc grpc-go Affected: < 1.82.2
Affected: >= 1.83.0, < 1.83.2
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "grpc-go",
          "vendor": "grpc",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.82.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.83.0, \u003c 1.83.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "gRPC-Go is the Go language implementation of gRPC. Prior to 1.82.2 and 1.83.2, servers created with xds.NewGRPCServer() allow internal/transport/http2_server.go to accept an RPC containing neither the :authority header nor the Host header, while RouteAndProcess in internal/xds/server/routing.go assumes that an authority value exists and indexes the empty slice. A remote client that can complete transport connection establishment can trigger an index-out-of-bounds panic that is not recovered by the per-RPC goroutine and terminates the entire server process. In insecure or ordinary TLS deployments the request can be unauthenticated, while strict mTLS or ALTS deployments require valid transport credentials before the malformed RPC can reach the interceptor. This issue is fixed in versions 1.82.2 and 1.83.2."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-129",
              "description": "CWE-129: Improper Validation of Array Index",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-248",
              "description": "CWE-248: Uncaught Exception",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T16:11:41.401Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wj",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wj"
        },
        {
          "name": "https://github.com/grpc/grpc-go/issues/9354",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-go/issues/9354"
        },
        {
          "name": "https://github.com/grpc/grpc-go/pull/9365",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-go/pull/9365"
        },
        {
          "name": "https://github.com/grpc/grpc-go/pull/9366",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-go/pull/9366"
        },
        {
          "name": "https://github.com/grpc/grpc-go/pull/9367",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-go/pull/9367"
        },
        {
          "name": "https://github.com/grpc/grpc-go/commit/3822494d8ea03b992c089fd2a195f041762fffb7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-go/commit/3822494d8ea03b992c089fd2a195f041762fffb7"
        },
        {
          "name": "https://github.com/grpc/grpc-go/commit/8668b69c167df908b6b3666dcbf40992b9e932a4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-go/commit/8668b69c167df908b6b3666dcbf40992b9e932a4"
        },
        {
          "name": "https://github.com/grpc/grpc-go/commit/93e31b48545e2a8aaeb6e06b47fb249f94e6297f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-go/commit/93e31b48545e2a8aaeb6e06b47fb249f94e6297f"
        },
        {
          "name": "https://github.com/grpc/grpc-go/releases/tag/v1.82.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-go/releases/tag/v1.82.2"
        },
        {
          "name": "https://github.com/grpc/grpc-go/releases/tag/v1.83.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/grpc/grpc-go/releases/tag/v1.83.2"
        }
      ],
      "source": {
        "advisory": "GHSA-2v4p-qf9q-27wj",
        "discovery": "UNKNOWN"
      },
      "title": "gRPC-Go: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in the xDS servers"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-84445",
    "datePublished": "2026-09-14T16:11:41.401Z",
    "dateReserved": "2026-09-01T20:05:09.422Z",
    "dateUpdated": "2026-09-14T16:11:41.401Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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