PT-2026-50839 · Undefined · Undefined

Igor Garofano · Published 2026-06-19 · Updated 2026-06-19 · CVE-2026-12644

Mitre

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Fix

Weakness Enumeration

CWE-248

Related Identifiers

CVE-2026-12644

Affected Products

Undefined

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-12644 · Security Note
• https://github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbff55a0733286f8c · Note
• https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141 · Note
• https://twitter.com/CVEnew/status/2067932712011514056 · Twitter Post
• https://twitter.com/infoflowcloud/status/2067934451804389788 · Twitter Post
• https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407 · Note
• https://twitter.com/VulmonFeeds/status/2067883507641090138 · Twitter Post