MEDIUM5.3
GHSA-87mf-gv2c-c62c
ts-deepmerge: Prototype Method Override leads to DoS
Quick fix
GHSA-87mf-gv2c-c62c — ts-deepmerge: upgrade to the fixed version with the command below.
npm install ts-deepmerge@8.0.0Details
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.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-12644[ADVISORY]
- https://github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbff55a0733286f8c[WEB]
- https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407[WEB]
- https://github.com/voodoocreation/ts-deepmerge[PACKAGE]
- https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141[WEB]