Denial of Service (DoS) Affecting next-auth package, versions <3.29.5 >=4.0.0 <4.5.0



    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.07% (28th percentile)
Expand this section
7.5 high

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  • Snyk ID SNYK-JS-NEXTAUTH-2933545
  • published 22 Jun 2022
  • disclosed 21 Jun 2022
  • credit stensrud

How to fix?

Upgrade next-auth to version 3.29.5, 4.5.0 or higher.


next-auth is an Authentication for Next.js

Affected versions of this package are vulnerable to Denial of Service (DoS) due to improper handling of callbackUrl. Exploiting this vulnerability could be done via sending an invalid callbackUrl query parameter, causing an unhandled error to be thrown, leading to the API route handler timing out and the logging in to fail.


Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package