github - ghsa-8gw3-rxh4-v6jx

GHSA-8GW3-RXH4-V6JX

Vulnerability from github – Published: 2025-11-14 18:31 – Updated: 2025-11-17 18:39

Summary

expr-eval vulnerable to Prototype Pollution

Details

npm package expr-eval is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.

Severity ?

7.3 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "expr-eval"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "expr-eval-fork"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-13204"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-11-17T18:39:19Z",
    "nvd_published_at": "2025-11-14T17:16:01Z",
    "severity": "HIGH"
  },
  "details": "npm package `expr-eval` is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.",
  "id": "GHSA-8gw3-rxh4-v6jx",
  "modified": "2025-11-17T18:39:19Z",
  "published": "2025-11-14T18:31:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-13204"
    },
    {
      "type": "WEB",
      "url": "https://github.com/silentmatt/expr-eval/pull/252/files"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jorenbroekema/expr-eval/commit/6c475a118643ae0efe012de283e932fb8b74324b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/silentmatt/expr-eval/commit/6e889e0e75c50ac37d70c35388602025650e0c50"
    },
    {
      "type": "WEB",
      "url": "https://github.com/SECCON/SECCON2022_final_CTF/blob/main/jeopardy/web/babybox/solver/solver.py"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jorenbroekema/expr-eval"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/silentmatt/expr-eval"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.py"
    },
    {
      "type": "WEB",
      "url": "https://www.huntr.dev/bounties/1-npm-expr-eval"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/package/expr-eval-fork"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "expr-eval vulnerable to Prototype Pollution"
}

CVE-2025-13204 (GCVE-0-2025-13204)

Vulnerability from cvelistv5 – Published: 2025-11-14 17:02 – Updated: 2025-11-14 20:41

Summary

npm package `expr-eval` is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.

Severity ?

No CVSS data available.

CWE

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

Assigner

certcc

References

URL

Tags

	https://www.npmjs.com/package/expr-eval-fork
	https://github.com/silentmatt/expr-eval
	https://github.com/jorenbroekema/expr-eval
	https://www.huntr.dev/bounties/1-npm-expr-eval/	third-party-advisory
	https://github.com/SECCON/SECCON2022_final_CTF/bl…
	https://github.com/silentmatt/expr-eval/pull/252/files	patch
	https://github.com/vladko312/extras/blob/f549d505…	exploit

Impacted products

	Vendor	Product	Version
	silentmatt	expr-eval	Affected: 0 , ≤ 2.0.2 (custom)

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JSON

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{
  "containers": {
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        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 7.3,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
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                {
                  "definition": "Can an attacker reliably automate creating exploitation events for this vulnerability?",
                  "key": "A",
                  "name": "Automatable",
                  "namespace": "ssvc",
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          "url": "https://github.com/silentmatt/expr-eval/pull/252/files"
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-8GW3-RXH4-V6JX

CVE-2025-13204 (GCVE-0-2025-13204)

Tags

Sightings

Nomenclature