medium5.3
CVE-2026-12644
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 …
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | ts-deepmerge | < 8.0.0 | 8.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-87mf-gv2c-c62c
- https://nvd.nist.gov/vuln/detail/CVE-2026-12644
- https://github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbff55a0733286f8c
- https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407
- https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141