SB20260422207 - Inefficient regular expression complexity in path-to-regexp
Published: April 22, 2026
Security Bulletin ID
SB20260422207
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Inefficient regular expression complexity (CVE-ID: CVE-2026-4867)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a bad regular expression is generated any time you have three or more parameters within a single segment, separated by something that is not a period (.). A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.
Remediation
Install update from vendor's website.