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GHSA-f23m-r3pf-42rh

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

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-2950

Packages

EcosystemPackageAffectedFixed in
npm lodash >= 4.17.23, < 4.18.1 4.18.1
npm lodash-es >= 4.17.23, < 4.18.1 4.18.1
npm lodash-amd >= 4.17.23, < 4.18.1 4.18.1
npm lodash.unset < 4.18.0 4.18.0
npm lodash.omit < 4.18.0 4.18.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact The `_.unset`, `_.omit`, and `_.pullAt` functions are vulnerable to prototype pollution. The fix for [CVE-2025-13465](https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg) 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. ### Workarounds None. Upgrade to the patched version. ### References - [CVE-2025-13465 / GHSA-xxjr-mmjv-4gpg](https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg) (original fix that this bypasses)

References

External links from the advisory. They lead to third-party sites.