Moderate severityNVD Advisory· Published Jun 19, 2026
CVE-2026-12644
CVE-2026-12644
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
ts-deepmergenpm | < 8.0.0 | 8.0.0 |
Affected products
1- Range: <8.0.0
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-87mf-gv2c-c62cghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-12644ghsaADVISORY
- gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407ghsaWEB
- github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbff55a0733286f8cghsaWEB
- security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141ghsaWEB
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