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Vapor URLEncodedFormDecoder Security Vulnerability

We've just released Vapor 4.61.1 which contains a fix for a security vulnerability in Vapor's URLEncodedFormDecoder. An attacker could crash a Vapor application by sending heavily nested data in a request body with a application/x-www-form-urlencoded Content-Type, leading to a Denial of Service attack. This has been designated as CVE-2022-31019.

We've limited the amount of recursion the decoder can undertake to stop future attacks and audited other code instances where we recursively decode data. You can see more details on the Security Advisory on GitHub.

Since this affects anyone calling req.content.decode() we recommend you upgrade to this release as soon as possible.

Thank you to Johannes Weiss for reporting!

06 June 2022
Written by Tim
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