Zod denial of service vulnerability during email validation

Summary

### Impact API servers running `express-zod-api` having: - version of `express-zod-api` below `10.0.0-beta1`, - and using the following (or similar) validation schema in its implementation: `z.string().email()`, are vulnerable to a DoS attack due to: - Inefficient Regular Expression Complexity in `zod` versions up to `3.22.2`, - depending on `zod`. ### Patches The patched version of `zod` fixing the vulnerability is `3.22.3`. However, it's highly recommended to upgrade `express-zod-api` to at least version `10.0.0`, which does not depend on `zod` strictly and directly, but requires its installation as a peer dependency instead, enabling you to install the patched `zod` version yourself. ### Workarounds When it's not possible to upgrade your dependencies, consider the following replacement in your implementation: ```diff - z.string().email() + z.string().regex( + /^(?!\.)(?!.*\.\.)([A-Z0-9_+-\.]*)[A-Z0-9_+-]@([A-Z0-9][A-Z0-9\-]*\.)+[A-Z]{2,}$/i + ) ``` This regular expression is taken from the suggested patch of `zod`. ### References - Original issue: https://github.com/colinhacks/zod/issues/2609 - The patch: https://github.com/colinhacks/zod/pull/2824 - Entry in database: https://nvd.nist.gov/vuln/detail/CVE-2023-4316 - Enumeration: https://cwe.mitre.org/data/definitions/1333.html - Parent advisory: https://github.com/advisories/GHSA-m95q-7qp3-xv42 - Changelog entry for `express-zod-api` version `10.0.0-beta1`: https://github.com/RobinTail/express-zod-api/blob/master/CHANGELOG.md#v1000-beta1