CVE-2026-72912: Gchq Cyberchef

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.3.0, CyberChef's pretty-recipe parser in src/core/Utils.mjs can exhaust client-side CPU when a malformed #recipe= URL fragment containing a large number of unmatched quote characters reaches Utils.parseRecipeConfig(). The function synchronously applies a complex global regular expression that may perform heavy backtracking before rejecting the input, causing the victim's browser tab to freeze during startup for seconds or longer. No code execution, data exfiltration, or privilege escalation occurs. This issue is fixed in version 11.3.0.

Affected products

• Gchq Cyberchef: before 11.3.0 (fixed in 11.3.0)

Published 2026-08-10. Last modified 2026-09-09.