CVE-2026-104182 (GCVE-0-2026-104182)

Vulnerability from cvelistv5 – Published: 2026-10-01 20:15 – Updated: 2026-10-01 20:15
VLAI
Title
stream-json: JSONC parser and verifier re-scan the whole accumulated comment on every input chunk
Summary
stream-json is a micro-library of stream components for processing JSON and JSONC with a minimal memory footprint. Prior to 3.6.0, the JSONC parser at stream-json/jsonc/parser.js and verifier at stream-json/jsonc/verifier.js restart comment-terminator scanning from the opening slash whenever a block or line comment spans an input chunk, while retaining the accumulated comment buffer. Delivering a large valid comment across many small chunks therefore causes quadratic CPU work and can stall the Node.js event loop. The maintainer characterizes the attack vector as local because the documented JSONC input is locally owned or user-controlled configuration, rather than input intended for the open internet. This JSONC-only scope does not include the plain JSON parser, which advances through and discards consumed string and number data. This issue is fixed in version 3.6.0.
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
Vendor Product Version CPE status
uhop stream-json Affected: < 3.6.0
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "stream-json",
          "vendor": "uhop",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.6.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "stream-json is a micro-library of stream components for processing JSON and JSONC with a minimal memory footprint. Prior to 3.6.0, the JSONC parser at stream-json/jsonc/parser.js and verifier at stream-json/jsonc/verifier.js restart comment-terminator scanning from the opening slash whenever a block or line comment spans an input chunk, while retaining the accumulated comment buffer. Delivering a large valid comment across many small chunks therefore causes quadratic CPU work and can stall the Node.js event loop. The maintainer characterizes the attack vector as local because the documented JSONC input is locally owned or user-controlled configuration, rather than input intended for the open internet. This JSONC-only scope does not include the plain JSON parser, which advances through and discards consumed string and number data. This issue is fixed in version 3.6.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.2,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-407",
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-01T20:15:39.108Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/uhop/stream-json/security/advisories/GHSA-hqr4-qq8f-hg3x",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/uhop/stream-json/security/advisories/GHSA-hqr4-qq8f-hg3x"
        },
        {
          "name": "https://github.com/uhop/stream-json/commit/c0299dc168ce9455ef5ca5b6a0f6850ee7fa0468",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/uhop/stream-json/commit/c0299dc168ce9455ef5ca5b6a0f6850ee7fa0468"
        },
        {
          "name": "https://github.com/uhop/stream-json/releases/tag/3.6.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/uhop/stream-json/releases/tag/3.6.0"
        }
      ],
      "source": {
        "advisory": "GHSA-hqr4-qq8f-hg3x",
        "discovery": "UNKNOWN"
      },
      "title": "stream-json: JSONC parser and verifier re-scan the whole accumulated comment on every input chunk"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-104182",
    "datePublished": "2026-10-01T20:15:39.108Z",
    "dateReserved": "2026-10-01T18:54:15.118Z",
    "dateUpdated": "2026-10-01T20:15:39.108Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-104182",
      "date": "2026-10-02",
      "epss": "0.00138",
      "percentile": "0.02707"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "stream-json",
                "vendor": "uhop",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 3.6.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "stream-json is a micro-library of stream components for processing JSON and JSONC with a minimal memory footprint. Prior to 3.6.0, the JSONC parser at stream-json/jsonc/parser.js and verifier at stream-json/jsonc/verifier.js restart comment-terminator scanning from the opening slash whenever a block or line comment spans an input chunk, while retaining the accumulated comment buffer. Delivering a large valid comment across many small chunks therefore causes quadratic CPU work and can stall the Node.js event loop. The maintainer characterizes the attack vector as local because the documented JSONC input is locally owned or user-controlled configuration, rather than input intended for the open internet. This JSONC-only scope does not include the plain JSON parser, which advances through and discards consumed string and number data. This issue is fixed in version 3.6.0."
          }
        ],
        "id": "CVE-2026-104182",
        "lastModified": "2026-10-01T21:17:19.003",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 6.2,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 3.6,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-01T21:17:19.003",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/uhop/stream-json/commit/c0299dc168ce9455ef5ca5b6a0f6850ee7fa0468"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/uhop/stream-json/releases/tag/3.6.0"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/uhop/stream-json/security/advisories/GHSA-hqr4-qq8f-hg3x"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-407"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-02T00:46:11+00:00",
      "cve": "CVE-2026-104182",
      "id": "CVE-2026-104182",
      "initial_release_date": "2026-10-01T20:15:39.108000+00:00",
      "product_status:known_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "stream-json: stream-json: Denial of Service via inefficient comment scanning",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-104182.json",
      "version": "3"
    }
  }
}



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