What is CVE-2026-2950?
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.
The record classifies CVE-2026-2950 under weakness class CWE-1321. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 4 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 226 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 6.5 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - EPSS (FIRST)
- 0.3% probability of exploitation in the next 30 days, higher than 29.6% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 4.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-03-31
Is CVE-2026-2950 being exploited?
It currently carries a trending score of 12 in the Threadlinqs vulnerability feed.
Affected products and versions
- lodash: lodash, lodash-es, lodash-amd, lodash.unset
Affected software packages:
npm:lodash— patched in 4.18.0npm:lodash-es— patched in 4.18.0npm:lodash-amd— patched in 4.18.0npm:lodash.unset— patched in 4.18.0
How to fix CVE-2026-2950
Fixed versions are recorded for 4 packages: npm:lodash 4.18.0, npm:lodash-es 4.18.0, npm:lodash-amd 4.18.0, npm:lodash.unset 4.18.0. Vendor advisory: https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-2950
1 tracked threat in the Threadlinqs corpus references CVE-2026-2950, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. This product uses the NVD API but is not endorsed or certified by the NVD.