CVE-2026-4800

Summary

Impact:

The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. 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. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function().

Patches:

Users should upgrade to version 4.18.0.

Workarounds:

Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.

Affected Software

VendorProductVersion RangeStatus
lodashlodash4.0.0 < 4.18.0affected
lodashlodash4.18.0unaffected
lodashlodash-es4.0.0 < 4.18.0affected
lodashlodash-es4.18.0unaffected
lodashlodash-amd4.0.0 < 4.18.0affected
lodashlodash-amd4.18.0unaffected
lodashlodash.template4.0.0 < 4.18.0affected
lodashlodash.template4.18.0unaffected

Weaknesses

  • CWE-94: CWE-94: Improper Control of Generation of Code ('Code Injection')

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

lodash: lodash: Arbitrary code execution via untrusted input in template imports

Additional References

References