High severity7.5NVD Advisory· Published Sep 18, 2026· Updated Sep 23, 2026
CVE-2026-93753
CVE-2026-93753
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.
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Affected products
1Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-gcqx-w48m-w2h4ghsaADVISORY
- github.com/TehShrike/deepmerge/blob/5b87756a5671635679001cbac72aa42f23472c81/index.jsnvd
- github.com/TehShrike/deepmerge/issues/273nvd
- nvd.nist.gov/vuln/detail/CVE-2026-93753ghsa
- www.vulncheck.com/advisories/deepmerge-through-4.3.1-prototype-poisoning-via-mergeobjectnvd
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