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 CNA under the mitre root

CNA scorecard C 72/100 over 8129 records in the last 180 days details

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: 2026-10-25 20:10

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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    },
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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

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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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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

FKIE_CVE-2026-57439

GHSA-FX6F-382R-J72C

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