Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/gchq/CyberChef/commit/f77ddf489050b339faa978bb28da954bafd289a
- https://github.com/gchq/CyberChef/pull/2687
- https://github.com/gchq/CyberChef/releases/tag/v11.3.0
- https://github.com/gchq/CyberChef/security/advisories/GHSA-w74r-jxjh-gwr6
FAQ
What is CVE-2026-72912?
CVE-2026-72912 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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 #r...
How severe is CVE-2026-72912?
CVE-2026-72912 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-72912?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.