Critical (9.1). EPSS 5.0% chance of exploitation in the next 30 days. Fixed in lodash 4.17.12.
Versions of lodash lower than 4.17.12 are vulnerable to Prototype Pollution. The function defaultsDeep could be tricked into adding or modifying properties of Object.prototype using a constructor payload.
Severity
CVSS 3.1
9.1 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS
5.0% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)