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GHSA-gcqx-w48m-w2h4Published

deepmerge mergeObject() allows prototype poisoning of returned objects

Exact source revision recorded 27 Oct 2026 22:46:24 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

osv · GHSA-gcqx-w48m-w2h4

Published

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.

Source published
18 Sep 2026 18:31:44 UTC
Source modified
27 Oct 2026 21:45:04 UTC
Observed here
27 Oct 2026 22:46:24 UTC
Source terms
GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U

Publisher rating · LOW

ChangeIntel

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Sources read 31 Oct 17:17 UTC · 272 of 272 readable · 270 fully read · documentation 469/469 current

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