# CVE-2026-2950 — lodash

> As of 2026-08-26, CVE-2026-2950 is a MEDIUM-severity vulnerability in lodash, CVSS v3.1 6.5, EPSS 0.3% (29.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-2950, most recently “CVE-2026-4800: Lodash `_.template` Arbitrary Code Injection — Broken 4.18.0 Patch Exposes Supply-Chain Patch-Pinning Risk”.

**Last updated:** 2026-08-26

## 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](https://intel.threadlinqs.com/cwe/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 4.18.0
- `npm:lodash-es` — patched in 4.18.0
- `npm:lodash-amd` — patched in 4.18.0
- `npm: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](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.

- [CVE-2026-4800: Lodash `_.template` Arbitrary Code Injection — Broken 4.18.0 Patch Exposes Supply-Chain Patch-Pinning Risk](https://intel.threadlinqs.com/threat/TL-2026-2151) — HIGH · 2026-08-26

## 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.

**Other references**

- [github.com](https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-2950
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