GHSA-f23m-r3pf-42rh
Dashboard / Vulnerabilities / GHSA-f23m-r3pf-42rh
Summary: lodash vulnerable to prototype pollution via array-path bypass in `_.unset`, `_.omit`, and `_.pullAt
Details: ### 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: https://github.com/lodash/lodash/security/advisories/GHSA-f23m-r3pf-42rh, https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg, https://nvd.nist.gov/vuln/detail/CVE-2026-2950, https://github.com/lodash/lodash/commit/4f0e376589e1889e8993e212a5c9041112ad178e, https://github.com/lodash/lodash/commit/87e6676934f7b4450fad68c35f0325ba165b48f8, https://github.com/lodash/lodash/commit/bbcf0036d27ef936f175bf26e73e247994d8e1e4, https://github.com/lodash/lodash/commit/db27b6bb14b12a1451b20edf87dfe307b87a337d, https://github.com/lodash/lodash/commit/fe8d32eda854377349a4f922ab7655c8e5df9a0b, https://cna.openjsf.org/security-advisories.html, https://github.com/lodash/lodash, https://github.com/lodash/lodash/releases/tag/4.18.1
Affected packages
Package
Name: lodash
Purl: pkg:npm/lodash
Affected ranges
Type: SEMVER
Events:
