{"schema_version":"1.9.2","id":"GHSA-f23m-r3pf-42rh","published":"2026-04-01T23:50:27Z","modified":"2026-11-03T15:45:08.465610798Z","aliases":["CVE-2026-2950"],"summary":"lodash vulnerable to prototype pollution via array-path bypass in `_.unset`, `_.omit`, and `_.pullAt","details":"### Impact\n\nThe `_.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`.\n\nThe issue permits deletion of prototype properties but does not allow overwriting their original behavior.\n\n### Patches\n\nThe 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.\n\n### Workarounds\n\nNone. Upgrade to the patched version.\n\n### References\n\n- [CVE-2025-13465 / GHSA-xxjr-mmjv-4gpg](https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg) (original fix that this bypasses)","affected":[{"package":{"name":"lodash","ecosystem":"npm","purl":"pkg:npm/lodash"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.17.23"},{"fixed":"4.18.1"}]}],"versions":["4.17.23"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-f23m-r3pf-42rh/GHSA-f23m-r3pf-42rh.json"}},{"package":{"name":"lodash-es","ecosystem":"npm","purl":"pkg:npm/lodash-es"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.17.23"},{"fixed":"4.18.1"}]}],"versions":["4.17.23"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-f23m-r3pf-42rh/GHSA-f23m-r3pf-42rh.json"}},{"package":{"name":"lodash-amd","ecosystem":"npm","purl":"pkg:npm/lodash-amd"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.17.23"},{"fixed":"4.18.1"}]}],"versions":["4.17.23"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-f23m-r3pf-42rh/GHSA-f23m-r3pf-42rh.json"}},{"package":{"name":"lodash.unset","ecosystem":"npm","purl":"pkg:npm/lodash.unset"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.18.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-f23m-r3pf-42rh/GHSA-f23m-r3pf-42rh.json"}},{"package":{"name":"lodash.omit","ecosystem":"npm","purl":"pkg:npm/lodash.omit"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.18.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-f23m-r3pf-42rh/GHSA-f23m-r3pf-42rh.json"}}],"references":[{"type":"WEB","url":"https://github.com/lodash/lodash/security/advisories/GHSA-f23m-r3pf-42rh"},{"type":"WEB","url":"https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2950"},{"type":"WEB","url":"https://github.com/lodash/lodash/commit/4f0e376589e1889e8993e212a5c9041112ad178e"},{"type":"WEB","url":"https://github.com/lodash/lodash/commit/87e6676934f7b4450fad68c35f0325ba165b48f8"},{"type":"WEB","url":"https://github.com/lodash/lodash/commit/bbcf0036d27ef936f175bf26e73e247994d8e1e4"},{"type":"WEB","url":"https://github.com/lodash/lodash/commit/db27b6bb14b12a1451b20edf87dfe307b87a337d"},{"type":"WEB","url":"https://github.com/lodash/lodash/commit/fe8d32eda854377349a4f922ab7655c8e5df9a0b"},{"type":"WEB","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"PACKAGE","url":"https://github.com/lodash/lodash"},{"type":"WEB","url":"https://github.com/lodash/lodash/releases/tag/4.18.1"}],"database_specific":{"cwe_ids":["CWE-1321"],"github_reviewed":true,"github_reviewed_at":"2026-04-01T23:50:27Z","nvd_published_at":"2026-03-31T20:16:26Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"}]}