SecuriTricks - 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.

Product(s) Impacted

Vendor	Product	Versions
Ts-deepmerge	Ts-deepmerge	<8.0.0

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-248

Uncaught Exception

An exception is thrown from a function, but it is not caught.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	ts-deepmerge	ts-deepmerge	<8.0.0	/	/	/	/	/	/	/

References

https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407

https://github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbff55a0733286f8c

https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141

CVSS Score

5.5 / 10

CVSS Data - 4.0

Attack Vector: NETWORK
Attack Complexity: LOW
Attack Requirements: NONE
Privileges Required: NONE
User Interaction: NONE
Scope:
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: LOW
Exploit Maturity: PROOF_OF_CONCEPT

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

View Vector String

Timeline

Published: June 19, 2026, 6:17 a.m.
Last Modified: June 19, 2026, 6:17 a.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-12644