ts-deepmerge: Prototype Method Override leads to DoS
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-12644US | — | — | ||
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)… | ||||
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references
External citations — patches, advisories, analysis.
- https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407WEB
- https://github.com/voodoocreation/ts-deepmergePACKAGE
- https://github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbff55a0733286f8cWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-12644ADVISORY
- https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141WEB
scry
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