SB2026061962 - Resource exhaustion in React Router
Published: June 19, 2026
Security Bulletin ID
SB2026061962
CSH Severity
Medium
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 vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2026-42342)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the __manifest endpoint when handling crafted requests with unbounded path expansion. A remote attacker can send a specially crafted request to cause a denial of service.
Only React Router Framework Mode applications are affected; Declarative Mode and Data Mode are not impacted.
Remediation
Install update from vendor's website.