CyberChef: Prototype pollution in Series Chart operation

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Summary

CVECVE-2026-57439
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 16:16:31 UTC
Updated2026-07-08 17:17:25 UTC
DescriptionCyberChef 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.

Risk And Classification

Primary CVSS: v3.1 5 MEDIUM from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gchq CyberChef affected < 11.2.0 Not specified

References

ReferenceSourceLinkTags
github.com/gchq/CyberChef/releases/tag/v11.2.0 [email protected] github.com
github.com/gchq/CyberChef/issues/2568 [email protected] github.com
github.com/gchq/CyberChef/pull/2569 [email protected] github.com
github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f [email protected] github.com
github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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