CVE-2026-2950
CVE-2026-2950 is a medium-severity vulnerability in Lodash with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1321.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- EPSS exploit prediction: 0% (24th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-17591
- Weakness: CWE-1321
- Affected product: Lodash
- Published:
- Last modified:
Description
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.
Frequently asked questions
- 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.
- How severe is CVE-2026-2950?
- CVE-2026-2950 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
- Is CVE-2026-2950 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-2950?
- CVE-2026-2950 primarily affects Lodash. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-2950?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-2950 have an EU (EUVD) identifier?
- Yes. CVE-2026-2950 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17591.
- When was CVE-2026-2950 published?
- CVE-2026-2950 was published on 2026-03-31 and last updated on 2026-06-17.
References
Affected products (4)
- cpe:2.3:a:lodash:lodash:*:*:*:*:*:node.js:*:*
- cpe:2.3:a:lodash:lodash-amd:*:*:*:*:*:node.js:*:*
- cpe:2.3:a:lodash:lodash-es:*:*:*:*:*:node.js:*:*
- cpe:2.3:a:lodash:lodash.unset:*:*:*:*:*:node.js:*:*
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