lodash vulnerable to Prototype Pollution via array path bypass in `_.unset` and `_.omit`

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-2950
StatePUBLISHED
Assigneropenjs
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-31 20:16:26 UTC
Updated2026-04-01 14:23:37 UTC
DescriptionImpact: 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from ce714d77-add3-4f53-aff5-83d477b104bb

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

EPSS: 0.000420000 probability, percentile 0.127550000 (date 2026-04-01)

Problem Types: CWE-1321 | CWE-1321 CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

VersionSourceTypeScoreSeverityVector
3.1ce714d77-add3-4f53-aff5-83d477b104bbSecondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Lodash Lodash affected 4.17.23 4.18.0 semver Not specified
CNA Lodash Lodash unaffected 4.18.0 semver Not specified
CNA Lodash Lodash-es affected 4.17.23 4.18.0 semver Not specified
CNA Lodash Lodash-es unaffected 4.18.0 semver Not specified
CNA Lodash Lodash-amd affected 4.17.23 4.18.0 semver Not specified
CNA Lodash Lodash-amd unaffected 4.18.0 semver Not specified
CNA Lodash Lodash.unset affected 4.0.0 4.18.0 semver Not specified
CNA Lodash Lodash.unset unaffected 4.18.0 semver Not specified

References

ReferenceSourceLinkTags
github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg ce714d77-add3-4f53-aff5-83d477b104bb github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Haruna38 (en)

CNA: shpik-kr (en)

CNA: maru1009 (en)

CNA: ott3r07 (en)

CNA: zolbooo (en)

CNA: backuardo (en)

CNA: falsyvalues (en)

CNA: jonchurch (en)

CNA: jdalton (en)

CNA: UlisesGascon (en)

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