Vulnerability advisory

GHSA-f23m-r3pf-42rh

lodash vulnerable to prototype pollution via array-path bypass in `_.unset`, `_.omit`, and `_.pullAt

Published Apr 1, 2026Updated Nov 3, 2026OSV record ↗

Also known as CVE-2026-2950

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Affected versions

lodash npm

All lodash advisories →

Affected	Fixed in
`4.17.23` to before 4.18.1	`4.18.1`Advisories →
Also listed as affected (1) `4.17.23`

lodash-es npm

All lodash-es advisories →

Affected	Fixed in
`4.17.23` to before 4.18.1	`4.18.1`Advisories →
Also listed as affected (1) `4.17.23`

lodash-amd npm

All lodash-amd advisories →

Affected	Fixed in
`4.17.23` to before 4.18.1	`4.18.1`Advisories →
Also listed as affected (1) `4.17.23`

lodash.unset npm

All lodash.unset advisories →

Affected	Fixed in
All versions before 4.18.0	`4.18.0`Advisories →

lodash.omit npm

All lodash.omit advisories →

Affected	Fixed in
All versions before 4.18.0	`4.18.0`Advisories →

Description

Impact

The _.unset, _.omit, and _.pullAt functions are vulnerable to prototype pollution. 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

The issue is patched from 4.18.0 to 4.18.1 depending on the package: lodash, lodash-es, and lodash-amd in 4.18.1, and the standalone lodash.unset and lodash.omit packages in 4.18.0.