protobufjs: Denial of Service via infinite loop in .proto option parsing

{
  "id": "ddd7b40baa84e4945608f5ee22399e610017a4fd6c6a06f3aa88446c61d344ea",
  "url": "https://osv.dev/vulnerability/CVE-2026-59877",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "protobufjs: Denial of Service via infinite loop in .proto option parsing",
    "summary": "protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.6.5 and 8.6.6, protobufjs parsed option names by advancing through schema tokens until reaching an = token without checking for end of input, so a crafted .proto schema that opens an option declaration and ends prematurely can cause parse, Root.load, or Root.loadSync to loop indefinitely. This issue is fixed in versions 7.6.5 and 8.6.6.",
    "evidence": "osv:CVE-2026-59877",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-59877",
      "aliases": [
        "CVE-2026-59877",
        "GHSA-j3f2-48v5-ccww"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/protobufjs/protobuf.js",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1dbcfe322899aca50fb82916db7802f647f23f0e"
                },
                {
                  "fixed": "89048ba0bbf3ed78f77199102f0614dafc2b4860"
                },
                {
                  "introduced": "933e8750dcd000c16a621a7344a4beaa034c4019"
                },
                {
                  "fixed": "55e4c8f8eadfc21c848f6a1eedd1b383a3720099"
                },
                {
                  "fixed": "10fba6d54815ceecca8a06b9a6db490c8f5d2217"
                },
                {
                  "fixed": "fa5c73add738ceb471e74da8cc2f3727c3d0a69f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "7.5.0"
                      },
                      {
                        "fixed": "7.6.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "fixed": "8.6.6"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "10fba6d54815ceecca8a06b9a6db490c8f5d2217"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "fa5c73add738ceb471e74da8cc2f3727c3d0a69f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "89048ba0bbf3ed78f77199102f0614dafc2b4860"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "protobufjs-v7.6.5"
                  },
                  {
                    "range": [
                      {
                        "fixed": "55e4c8f8eadfc21c848f6a1eedd1b383a3720099"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "protobufjs-v8.6.6"
                  }
                ]
              }
            }
          ],
          "versions": [
            "protobufjs-v7.6.4",
            "protobufjs-v8.6.5",
            "protobufjs-cli-v2.5.6",
            "protobufjs-v8.6.4",
            "protobufjs-cli-v2.5.5",
            "protobufjs-v7.6.3",
            "protobufjs-cli-v1.3.3",
            "protobufjs-v8.6.3",
            "protobufjs-cli-v2.5.4",
            "protobufjs-v8.6.2",
            "protobufjs-cli-v2.5.3",
            "protobufjs-v7.6.2",
            "protobufjs-cli-v1.3.2",
            "protobufjs-v8.6.1",
            "protobufjs-cli-v2.5.2",
            "protobufjs-v8.6.0",
            "protobufjs-cli-v2.5.1",
            "protobufjs-v8.5.0",
            "protobufjs-cli-v2.5.0",
            "utf8-v1.1.1",
            "protobufjs-v7.6.1",
            "protobufjs-cli-v1.3.1",
            "pool-v1.1.0",
            "path-v1.1.2",
            "float-v1.0.2",
            "eventemitter-v1.1.1",
            "codegen-v2.0.5",
            "base64-v1.1.2",
            "aspromise-v1.1.2",
            "protobufjs-v8.4.2",
            "protobufjs-cli-v2.4.2",
            "protobufjs-v8.4.1",
            "protobufjs-cli-v2.4.1",
            "protobufjs-v7.6.0",
            "protobufjs-cli-v1.3.0",
            "protobufjs-v8.4.0",
            "protobufjs-cli-v2.4.0",
            "protobufjs-v7.5.9",
            "inquire-v1.1.2",
            "fetch-v1.1.1",
            "protobufjs-v7.5.8",
            "protobufjs-v8.3.0",
            "protobufjs-cli-v2.3.0",
            "protobufjs-v8.2.1",
            "protobufjs-cli-v2.2.1",
            "protobufjs-v7.5.7",
            "protobufjs-v8.2.0",
            "protobufjs-cli-v2.2.0",
            "protobufjs-cli-v1.2.2",
            "protobufjs-cli-v2.0.3",
            "protobufjs-v7.5.6",
            "protobufjs-cli-v1.2.1",
            "protobufjs-v8.0.3",
            "protobufjs-v8.0.2",
            "protobufjs-cli-v2.0.2",
            "protobufjs-v7.5.5",
            "protobufjs-v8.0.1",
            "protobufjs-cli-v2.0.1",
            "protobufjs-v7.5.4",
            "protobufjs-v8.0.0",
            "protobufjs-cli-v2.0.0",
            "protobufjs-v7.5.3",
            "protobufjs-v7.5.2",
            "protobufjs-v7.5.1",
            "protobufjs-v7.5.0",
            "protobufjs-cli-v1.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59877.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.356934961Z",
      "provider": "osv",
      "references": [
        "https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5",
        "https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59877.json",
        "https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-59877",
        "https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217",
        "https://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69f",
        "https://github.com/protobufjs/protobuf.js/pull/2352"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-835"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59877.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-59877",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521352,
  "published_at": "2026-07-08T15:28:07.696+00:00"
}