CVE-2026-93753

HighCVSS 7.5/10Last modified Sep 23, 2026

Description

deepmerge through 4.3.1 contains a prototype poisoning vulnerability in the mergeObject() function that fails to properly validate keys being written to target objects. Attackers can supply malicious source objects in merge operations to inject attacker-controlled properties into the returned object's prototype, causing applications to inherit unintended values when accessing properties without own-property checks.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-1321

Affected software

No affected versions have been published.

Timeline

Published: Sep 18, 2026
Last modified: Sep 23, 2026
NVD status: Deferred

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