Vulnerability-Lookup

CVE-2026-57439 (GCVE-0-2026-57439)

Vulnerability from cvelistv5 – Published: 2026-07-08 14:58 – Updated: 2026-07-08 16:12

Title

CyberChef: Prototype pollution in Series Chart operation

Summary

CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2.0, the Series Chart operation accepts __proto__ as a key while parsing user-supplied CSV, allowing prototype pollution that can be chained with operations such as Parse UDP to inject malicious JavaScript into HTML output. This issue is fixed in version 11.2.0.

Severity

5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-08 16:12 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

GitHub_M mitre root Scorecard

References

5 references

URL	Tags
https://github.com/gchq/CyberChef/security/adviso…	x_refsource_CONFIRM
https://github.com/gchq/CyberChef/issues/2568	x_refsource_MISC
https://github.com/gchq/CyberChef/pull/2569	x_refsource_MISC
https://github.com/gchq/CyberChef/commit/85db3be5…	x_refsource_MISC
https://github.com/gchq/CyberChef/releases/tag/v11.2.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
gchq	CyberChef	Affected: < 11.2.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-57439

Vulnerability from fkie_nvd - Published: 2026-07-08 16:16 - Updated: 2026-07-10 17:56

Severity

5.0 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f
	security-advisories@github.com	https://github.com/gchq/CyberChef/issues/2568
	security-advisories@github.com	https://github.com/gchq/CyberChef/pull/2569
	security-advisories@github.com	https://github.com/gchq/CyberChef/releases/tag/v11.2.0
	security-advisories@github.com	https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-FX6F-382R-J72C

Vulnerability from github – Published: 2026-09-24 19:24 – Updated: 2026-09-24 19:24

Summary

CyberChef: Prototype pollution in Series Chart operation

Details

On 5 June 2026 CyberChef received a security vulnerability report from @hyuunnn detailing a vulnerability in the Series Chart operation, where malicious input could result in prototype pollution of the data structures outputted from the operation. Other operations following Series Chart could have their behaviour manipulated by the attacker-controlled prototype, for example, injecting malicious content into their HTML output.

In this case, a demonstration was provided that chained the Series Chart operation with the Parse UDP operation to cause attacker controlled JavaScript to be executed.

Details

When the Series Chart operation parses user-supplied CSV, it accepts __proto__ as a key and uses it to pollute the object. The objToTbale function in src/core/lib/Protocol.mjs, used in a number of IP parsing operations, renders data items within <td> tags without escaping. These bugs can be chained to produce an XSS vulnerability.

Proof of Concept https://gchq.github.io/CyberChef/#recipe=Series_chart('CRLF','Comma','',1,'')Parse_UDP('Raw')&input=X19wcm90b19fLDxpbWcgc3JjPXggb25lcnJvcj1hbGVydChkb2N1bWVudC5kb21haW4pPiwxParse_UDP('Raw')&input=X19wcm90b19fLDxpbWcgc3JjPXggb25lcnJvcj1hbGVydChkb2N1bWVudC5kb21haW4pPiwx)

Encoded input data is:

__proto__,<img src=x onerror=alert(document.domain)>,1

Impact

Objects with attacker controlled prototypes could be processed by CyberChef operations. This enabled control of the output of some operations, and in particular, the ability to insert malicious JavaScript into the output of the Parse UDP operation.

Patches

This has been patched in release v11.2.0.

Workarounds

No workarounds are available. Users must upgrade to CyberChef v11.2.0.

Severity

5.0 (Medium)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "cyberchef"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-57439"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321",
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-24T19:24:30Z",
    "nvd_published_at": "2026-07-08T16:16:31Z",
    "severity": "MODERATE"
  },
  "details": "On 5 June 2026 CyberChef received a security vulnerability report from @hyuunnn detailing a vulnerability in the Series Chart operation, where malicious input could result in prototype pollution of the data structures outputted from the operation.\nOther operations following Series Chart could have their behaviour manipulated by the attacker-controlled prototype, for example, injecting malicious content into their HTML output.\n\nIn this case, a demonstration was provided that chained the Series Chart operation with the Parse UDP operation to cause attacker controlled JavaScript to be executed.\n\n## Details\nWhen the Series Chart operation parses user-supplied CSV, it accepts `__proto__` as a key and uses it to pollute the object.\nThe objToTbale function in src/core/lib/Protocol.mjs, used in a number of IP parsing operations, renders data items within `\u003ctd\u003e` tags without escaping.\nThese bugs can be chained to produce an XSS vulnerability.\n\n**Proof of Concept**\n[https://gchq.github.io/CyberChef/#recipe=Series_chart(\u0027CRLF\u0027,\u0027Comma\u0027,\u0027\u0027,1,\u0027\u0027)Parse_UDP(\u0027Raw\u0027)\u0026input=X19wcm90b19fLDxpbWcgc3JjPXggb25lcnJvcj1hbGVydChkb2N1bWVudC5kb21haW4pPiwx](https://gchq.github.io/CyberChef/#recipe=Series_chart(\u0027CRLF\u0027,\u0027Comma\u0027,\u0027\u0027,1,\u0027\u0027)Parse_UDP(\u0027Raw\u0027)\u0026input=X19wcm90b19fLDxpbWcgc3JjPXggb25lcnJvcj1hbGVydChkb2N1bWVudC5kb21haW4pPiwx)\n\nEncoded input data is:\n```\n__proto__,\u003cimg src=x onerror=alert(document.domain)\u003e,1\n```\n\n### Impact\nObjects with attacker controlled prototypes could be processed by CyberChef operations. This enabled control of the output of some operations, and in particular, the ability to insert malicious JavaScript into the output of the Parse UDP operation.\n\n### Patches\nThis has been patched in release v11.2.0.\n\n### Workarounds\nNo workarounds are available. Users must upgrade to CyberChef v11.2.0.",
  "id": "GHSA-fx6f-382r-j72c",
  "modified": "2026-09-24T19:24:30Z",
  "published": "2026-09-24T19:24:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-57439"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gchq/CyberChef/issues/2568"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gchq/CyberChef/pull/2569"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gchq/CyberChef"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gchq/CyberChef/releases/tag/v11.2.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "CyberChef: Prototype pollution in Series Chart operation"
}

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CVE-2026-57439 (GCVE-0-2026-57439)

FKIE_CVE-2026-57439

GHSA-FX6F-382R-J72C

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