Resource exhaustion in React Router - CVE-2026-42342
Published: June 19, 2026
Vulnerability identifier: #VU134919
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-42342
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
React Router
server-runtime
Jira Service Management Data Center
Jira Software Data Center
IBM SPSS Collaboration and Deployment Services
server-runtime
Jira Service Management Data Center
Jira Software Data Center
IBM SPSS Collaboration and Deployment Services
How to mitigate CVE-2026-42342
Install security update from vendor's website.
React Router - update to 7.15.0
server-runtime - update to 2.17.5
Jira Service Management Data Center - update to 10.3.14
Jira Software Data Center - update to 10.3.14
IBM SPSS Collaboration and Deployment Services - update to 9.0.0.0.0 IF13
server-runtime - update to 2.17.5
Jira Service Management Data Center - update to 10.3.14
Jira Software Data Center - update to 10.3.14
IBM SPSS Collaboration and Deployment Services - update to 9.0.0.0.0 IF13