CVE-2026-4800: lodash vulnerable to Code Injection via `_.template` imports key names
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. 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().
References
- cna.openjsf.org/security-advisories.html
- github.com/advisories/GHSA-35jh-r3h4-6jhm
- github.com/advisories/GHSA-r5fr-rjxr-66jc
- github.com/lodash/lodash
- github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c
- github.com/lodash/lodash/security/advisories/GHSA-r5fr-rjxr-66jc
- nvd.nist.gov/vuln/detail/CVE-2026-4800
Code Behaviors & Features
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