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[USN-8290-1] Path-to-Regexp vulnerability

Posted on 22 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8290-1
May 21, 2026

node-path-to-regexp vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Path-to-Regexp could be made to crash if it received specially crafted
network traffic.

Software Description:
- node-path-to-regexp: Turn a path string such as /user/:name into a regular expression.

Details:

It was discovered that Path-to-Regexp incorrectly handled route patterns
containing multiple named parameters separated by non-delimiter characters
such as hyphens. An attacker could possibly use this issue to cause a denial
of service via catastrophic backtracking in the generated regular expressions.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
node-path-to-regexp 6.2.1-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
node-path-to-regexp 6.2.0-2ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
node-path-to-regexp 6.1.0-2ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
node-path-to-regexp 1.0.1-1ubuntu0.18.04.1~esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
node-path-to-regexp 1.0.1-1ubuntu0.16.04.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8290-1
CVE-2024-45296

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