GHSA-r5fr-rjxr-66jc

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GHSA-r5fr-rjxr-66jc

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

Details: ### 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. The fix applies two changes: 1. Validate `importsKeys` against the existing `reForbiddenIdentifierChars` regex (same check already used for the `variable` option) 2. Replace `assignInWith` with `assignWith` when merging imports, so only own properties are enumerated ### Workarounds Do not pass untrusted input as key names in `options.imports`. Only use developer-controlled, static key names.

References: https://github.com/lodash/lodash/security/advisories/GHSA-r5fr-rjxr-66jc, https://nvd.nist.gov/vuln/detail/CVE-2026-4800, https://github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c, https://cna.openjsf.org/security-advisories.html, https://github.com/advisories/GHSA-35jh-r3h4-6jhm, https://github.com/lodash/lodash