medium5.0
CVE-2026-57439
CyberChef is a web app for encryption, encoding, compression, and data analysis.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | cyberchef | < 11.2.0 | 11.2.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fx6f-382r-j72c
- https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c
- https://nvd.nist.gov/vuln/detail/CVE-2026-57439
- https://github.com/gchq/CyberChef/issues/2568
- https://github.com/gchq/CyberChef/pull/2569
- https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f
- https://github.com/gchq/CyberChef/releases/tag/v11.2.0