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:
- 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
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