Security advisory

{
  "id": "1abea940f07908d278bf652e605d3f547c8c5b3b75f36416fd80a7027d5b670f",
  "url": "https://osv.dev/vulnerability/CVE-2021-36154",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-36154",
    "summary": "HTTP2ToRawGRPCServerCodec in gRPC Swift 1.1.1 and earlier allows remote attackers to deny service via the delivery of many small messages within a single HTTP/2 frame, leading to Uncontrolled Recursion and stack consumption.",
    "evidence": "osv:CVE-2021-36154",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-36154",
      "aliases": [
        "CVE-2021-36154",
        "GHSA-4rhq-vq24-88gw"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/grpc/grpc-swift",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9e464a75079928366aa7041769a271fac89271bf"
                },
                {
                  "last_affected": "276f09147d914b6463f3ccdd39f51f7e0dd15aaa"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:grpc_swift:1.0.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.0.0"
                      },
                      {
                        "last_affected": "1.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:grpc_swift:1.1.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.1.0"
                      },
                      {
                        "last_affected": "1.1.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:grpc_swift:1.1.1:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.1.1"
                      },
                      {
                        "last_affected": "1.1.1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.0.0",
            "1.1.0",
            "1.1.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-36154.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:47.855622898Z",
      "provider": "osv",
      "references": [
        "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35274",
        "https://github.com/grpc/grpc-swift/releases",
        "https://github.com/grpc/grpc-swift/security/advisories/GHSA-4rhq-vq24-88gw"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-36154",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386146,
  "published_at": "2021-07-09T12:15:08.097+00:00"
}