SB2026061973 - Multiple vulnerabilities in server-runtime

Description

This security bulletin contains information about 2 vulnerabilities.

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.

2) Cross-site request forgery (CVE-ID: CVE-2026-53663)

CWE-ID: CWE-352 - Cross-Site Request Forgery (CSRF)

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform cross-site request forgery actions.

The vulnerability exists due to cross-site request forgery in document request handling when processing PUT, PATCH, or DELETE requests in framework mode. A remote attacker can cause the victim's browser to send a crafted cross-site request to perform cross-site request forgery actions.

This issue does not affect applications using declarative mode or data mode.

Remediation

Install update from vendor's website.

References

• https://github.com/advisories/GHSA-8x6r-g9mw-2r78
• https://github.com/remix-run/react-router/security/advisories/GHSA-84g9-w2xq-vcv6