Vulnerability-Lookup

GHSA-8CW4-87C7-C6XX

Vulnerability from github – Published: 2026-09-08 18:01 – Updated: 2026-09-08 18:01

Summary

node-csv: Prototype replacement still reachable via columns path

Details

Impact

With columns: true and group_columns_by_name: true, a duplicated proto header causes the duplicate-column branch to assign an array to obj['proto'], invoking the proto setter and replacing the parsed record object's prototype with attacker-controlled data. Fixed in 7.0.2 (Object.hasOwn duplicate check + Object.defineProperty assignment).

Patches

The problem been patched.

Workarounds

Disable usage of both the columns and group_columns_by_name options.

References

issue #496, PR #497

Severity

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "csv-parse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-85063"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-08T18:01:39Z",
    "nvd_published_at": "2026-09-03T21:17:23Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nWith columns: true and group_columns_by_name: true, a duplicated __proto__  header causes the duplicate-column branch to assign an array to obj[\u0027__proto__\u0027], invoking the __proto__ setter and replacing the parsed record object\u0027s prototype with attacker-controlled data. Fixed in 7.0.2 (Object.hasOwn duplicate check + Object.defineProperty assignment).\n\n### Patches\nThe problem been patched.\n\n### Workarounds\nDisable usage of both the columns and  group_columns_by_name options.\n\n### References\nissue #496, PR #497",
  "id": "GHSA-8cw4-87c7-c6xx",
  "modified": "2026-09-08T18:01:39Z",
  "published": "2026-09-08T18:01:39Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/adaltas/node-csv/security/advisories/GHSA-8cw4-87c7-c6xx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85063"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adaltas/node-csv/issues/496"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adaltas/node-csv/pull/497"
    },
    {
      "type": "WEB",
      "url": "https://github.com/adaltas/node-csv/commit/eb4d1484589c976dcb977db8dd0b90e015a6f66e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/adaltas/node-csv"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "node-csv: Prototype replacement still reachable via columns path"
}

CVE-2026-85063 (GCVE-0-2026-85063)

Vulnerability from cvelistv5 – Published: 2026-09-03 20:32 – Updated: 2026-09-04 17:44

Title

node-csv: Prototype replacement still reachable via columns path

Summary

node-csv is a full-featured CSV parser with a simple API that is tested against large datasets. Prior to 7.0.2, csv-parse with the columns and group_columns_by_name options enabled treats a duplicate __proto__ header as an existing property in packages/csv-parse/lib/api/index.js, assigns an attacker-controlled array through obj['__proto__'], and replaces the parsed record object's prototype. A malicious CSV header can therefore inject inherited array values into the returned record, hide those inherited values from JSON serialization, and affect property enumeration and type or shape checks in applications that process the record. This issue is fixed in version 7.0.2.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-04 17:43 UTC

CWE

CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/adaltas/node-csv/security/advi…	x_refsource_CONFIRM
https://github.com/adaltas/node-csv/issues/496	x_refsource_MISC
https://github.com/adaltas/node-csv/pull/497	x_refsource_MISC
https://github.com/adaltas/node-csv/commit/eb4d14…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
adaltas	node-csv	Affected: < 7.0.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-85063",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-04T17:43:46.602742Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-04T17:44:08.340Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/adaltas/node-csv/issues/496"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "node-csv",
          "vendor": "adaltas",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 7.0.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "node-csv is a full-featured CSV parser with a simple API that is tested against large datasets. Prior to 7.0.2, csv-parse with the columns and group_columns_by_name options enabled treats a duplicate __proto__ header as an existing property in packages/csv-parse/lib/api/index.js, assigns an attacker-controlled array through obj[\u0027__proto__\u0027], and replaces the parsed record object\u0027s prototype. A malicious CSV header can therefore inject inherited array values into the returned record, hide those inherited values from JSON serialization, and affect property enumeration and type or shape checks in applications that process the record. This issue is fixed in version 7.0.2."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "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:L/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1321",
              "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-03T20:32:46.145Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/adaltas/node-csv/security/advisories/GHSA-8cw4-87c7-c6xx",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/adaltas/node-csv/security/advisories/GHSA-8cw4-87c7-c6xx"
        },
        {
          "name": "https://github.com/adaltas/node-csv/issues/496",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/adaltas/node-csv/issues/496"
        },
        {
          "name": "https://github.com/adaltas/node-csv/pull/497",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/adaltas/node-csv/pull/497"
        },
        {
          "name": "https://github.com/adaltas/node-csv/commit/eb4d1484589c976dcb977db8dd0b90e015a6f66e",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/adaltas/node-csv/commit/eb4d1484589c976dcb977db8dd0b90e015a6f66e"
        }
      ],
      "source": {
        "advisory": "GHSA-8cw4-87c7-c6xx",
        "discovery": "UNKNOWN"
      },
      "title": "node-csv: Prototype replacement still reachable via columns path"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-85063",
    "datePublished": "2026-09-03T20:32:46.145Z",
    "dateReserved": "2026-09-02T21:21:01.774Z",
    "dateUpdated": "2026-09-04T17:44:08.340Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-8CW4-87C7-C6XX

Impact

Patches

Workarounds

References

CVE-2026-85063 (GCVE-0-2026-85063)

Tags

Sightings

Nomenclature