lodash vulnerable to Code Injection via `_.template` imports key names
Impact
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().
Patches
Users should upgrade to version 4.18.0.
The fix applies two changes:
- Validate
importsKeysagainst the existingreForbiddenIdentifierCharsregex (same check already used for thevariableoption) - Replace
assignInWithwithassignWithwhen 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.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | lodash | >= 4.0.0, < 4.18.0 | 4.18.0 |
| Paquete de npm | lodash-amd | >= 4.0.0, < 4.18.0 | 4.18.0 |
| Paquete de npm | lodash-es | >= 4.0.0, < 4.18.0 | 4.18.0 |
| Paquete de npm | lodash-template | <= 1.0.0 | sin corrección |
| Paquete de npm | lodash.template | >= 4.0.0, < 4.18.0 | 4.18.0 |
Referencias
- https://nvd.nist.gov/vuln/detail/CVE-2021-23337
- https://github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://snyk.io/vuln/SNYK-JS-LODASH-1040724
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1074929
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWERGITHUBLODASH-1074931
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-1074928
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1074930
- https://snyk.io/vuln/SNYK-JAVA-ORGFUJIONWEBJARS-1074932
- https://security.netapp.com/advisory/ntap-20210312-0006
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/lodash-rails/CVE-2021-23337.yml
- https://github.com/lodash/lodash/blob/ddfd9b11a0126db2302cb70ec9973b66baec0975/lodash.js#L14851
- https://github.com/lodash/lodash
- https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
- https://github.com/lodash/lodash/security/advisories/GHSA-r5fr-rjxr-66jc
- https://nvd.nist.gov/vuln/detail/CVE-2026-4800
- https://cna.openjsf.org/security-advisories.html
- https://github.com/advisories/GHSA-35jh-r3h4-6jhm
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-77, CWE-94- Plataforma
- npm
- Paquete
lodash, lodash-amd, lodash-es- Publicada
- 06.05.2021
- Actualizado
- 17.10.2026 05:17
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-35jh-r3h4-6jhm - CC BY 4.0
OSV / GitHub Advisory Database - GHSA-r5fr-rjxr-66jc - CC BY 4.0
Historial de vulnerabilidades: lodash-template
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