Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/TehShrike/deepmerge
- https://github.com/TehShrike/deepmerge/blob/5b87756a5671635679001cbac72aa42f2347
- https://github.com/TehShrike/deepmerge/issues/273
- https://www.vulncheck.com/advisories/deepmerge-through-4.3.1-prototype-poisoning
- https://github.com/TehShrike/deepmerge/issues/273
FAQ
What is CVE-2026-93753?
CVE-2026-93753 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-93753?
CVE-2026-93753 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-93753?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.