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CVE PROGRAM SOURCE RECORD8.1 High

CVE-2026-4800

lodash vulnerable to Code Injection via `_.template` imports key names

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
openjs

Description

The fix for CVE-2021-23337 added validation for the variable option in _.template but did not apply the same validation to options.imports key names, and both paths flow into the same Function() constructor sink. When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time. Additionally, _.template uses assignInWith to merge imports, which enumerates inherited properties via for..in, so if Object.prototype has been polluted by another vector the polluted keys are copied into the imports object and passed to Function(). The issue is fixed in 4.18.1 for lodash, lodash-es, lodash-amd, and lodash.template. As a workaround, do not pass untrusted input as key names in options.imports; use only developer-controlled, static key names.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

lodash lodash

Default version status: unaffected

  • 4.0.0 to < 4.18.1affected
  • 4.18.1unaffected
pkg:npm/lodash

lodash lodash-es

Default version status: unaffected

  • 4.0.0 to < 4.18.1affected
  • 4.18.1unaffected
pkg:npm/lodash-es

lodash lodash-amd

Default version status: unaffected

  • 4.0.0 to < 4.18.1affected
  • 4.18.1unaffected
pkg:npm/lodash-amd

lodash lodash.template

Default version status: unaffected

  • 4.0.0 to < 4.18.1affected
  • 4.18.1unaffected
pkg:npm/lodash.template

References