MediumGHSA-f23m-r3pf-42rhCVE-2026-2950

lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`

Published 1 Apr 2026 · Updated 17 Oct 2026

Affected packages

lodashnpm
Affected
<4.18.0
Fixed in
4.18.0
Update to the fixed version for your release line, for example:npm install lodash@4.18.0
lodash-esnpm
Affected
<4.18.0
Fixed in
4.18.0
Update to the fixed version for your release line, for example:npm install lodash-es@4.18.0
lodash-amdnpm
Affected
<4.18.0
Fixed in
4.18.0
Update to the fixed version for your release line, for example:npm install lodash-amd@4.18.0
lodash.unsetnpm
Affected
>=4.0.0 <4.18.0
Fixed in
4.18.0
Update to the fixed version for your release line, for example:npm install lodash.unset@4.18.0

Details

Impact

Lodash versions 4.17.23 and earlier are vulnerable to prototype pollution in the _.unset and _.omit functions. The fix for CVE-2025-13465 only guards against string key members, so an attacker can bypass the check by passing array-wrapped path segments. This allows deletion of properties from built-in prototypes such as Object.prototype, Number.prototype, and String.prototype.

The issue permits deletion of prototype properties but does not allow overwriting their original behavior.

Patches

This issue is patched in 4.18.0.

Workarounds

None. Upgrade to the patched version.

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.