EUVD-2026-17591
GHSA-f23m-r3pf-42rh
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Lifecycle Timeline
4Description
Impact: Lodash versions 4.17.23 and earlier are vulnerable to prototype pollution in the _.unset and _.omit functions. 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: This issue is patched in 4.18.0. Workarounds: None. Upgrade to the patched version.
Analysis
Prototype pollution in Lodash 4.17.23 and earlier allows unauthenticated remote attackers to delete properties from built-in prototypes (Object.prototype, Number.prototype, String.prototype) via array-wrapped path segments in _.unset and _.omit functions, bypassing the incomplete fix for CVE-2025-13465. The vulnerability has a CVSS score of 6.5 with low integrity and availability impact; no public exploit code or active exploitation has been confirmed at time of analysis.
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