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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00507.

Exploitation poc

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n/a ts-deepmerge affected
Version Status Constraints
0 affected < 8.0.0

No data.

No data.

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Vendors Products
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Ts-deepmerge Subscribe

Project Subscriptions

Vendors Products
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Ts-deepmerge Subscribe
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-87mf-gv2c-c62c ts-deepmerge: Prototype Method Override leads to DoS
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407 cve-icon cve-icon
https://github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbff55a0733286f8c cve-icon
https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141 cve-icon
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'}

Projects

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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