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.
Published: 2026-06-19
Score: 6.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-87mf-gv2c-c62c ts-deepmerge: Prototype Method Override leads to DoS
History

Wed, 24 Jun 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Voodoocreation
Voodoocreation ts-deepmerge
Vendors & Products Voodoocreation
Voodoocreation ts-deepmerge

Mon, 22 Jun 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 19 Jun 2026 07:45:00 +0000

Type Values Removed Values Added
Title Uncaught Exception in ts-deepmerge from Improper Handling of Object.prototype Methods

Fri, 19 Jun 2026 06:15:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-248
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P'}

cvssV4_0

{'score': 6.9, 'vector': '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'}


Subscriptions

Voodoocreation Ts-deepmerge
cve-icon MITRE

Status: PUBLISHED

Assigner: snyk

Published:

Updated: 2026-06-22T15:03:43.502Z

Reserved: 2026-06-18T18:00:17.870Z

Link: CVE-2026-12644

cve-icon Vulnrichment

Updated: 2026-06-22T15:03:01.118Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-24T20:41:54Z

Weaknesses