Vulnerability Description
Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controlled input contains these keys with non-function values, the resulting merged object becomes broken — any string context operation throws a TypeError, crashing the application.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407
- https://github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbf
- https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141
- https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407
FAQ
What is CVE-2026-12644?
CVE-2026-12644 is a vulnerability with a CVSS score of 5.3 (MEDIUM). Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controll...
How severe is CVE-2026-12644?
CVE-2026-12644 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-12644?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.