CVE-2026-57439
Medium
Description
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.
SeverityMedium
CVSS5.0
Exploit probability—
ProductCyberchef
PublishedJul 8, 2026
First seenJul 8, 2026
How to fix
Update
- cyberchef11.2.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cyberchefnpm | v < 11.2.0 | 11.2.0 |
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