FKIE_CVE-2026-59877

Vulnerability from fkie_nvd - Published: 2026-07-08 16:16 - Updated: 2026-07-08 17:17
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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.
References
security-advisories@github.comhttps://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217
security-advisories@github.comhttps://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69f
security-advisories@github.comhttps://github.com/protobufjs/protobuf.js/pull/2352
security-advisories@github.comhttps://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5
security-advisories@github.comhttps://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6
security-advisories@github.comhttps://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "protobuf.js",
          "vendor": "protobufjs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 7.5.0, \u003c 7.6.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 8.0.0, \u003c 8.6.6"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-59877",
  "lastModified": "2026-07-08T17:17:26.273",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-59877",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-08T15:48:58.903197Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-08T16:16:34.363",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/protobufjs/protobuf.js/pull/2352"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-835"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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