CVE-2026-12644 | Versions of the package ts-deepmerge before 8.0.0 are vulner… | CVSS 5.3 MEDIUM

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.

Metadata

CVE ID: CVE-2026-12644
State: PUBLISHED
Assigner: snyk
Reserved: 2026-06-18 18:00 UTC
Published: 2026-06-19 05:00 UTC
Last updated: 2026-06-19 05:00 UTC
Primary CWE: CWE-248
Uncaught Exception
Vendor / Product: n/a / ts-deepmerge
Sources: cve.org · NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P

Affected products (1)

Vendor	Product	Platform	Versions
n/a	ts-deepmerge	—	0 < 8.0.0

Weakness (CWE)

CWE	Source	Description
CWE-248	cna	Uncaught Exception

CVSS scores (2)

Score	Severity	Version	Source	Vector
6.9	MEDIUM	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
5.3	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P

References (3)