SB2026072843 - Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.21
Published: July 28, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Interpretation Conflict (CVE-ID: CVE-2026-13676)
CWE-ID: CWE-436 - Interpretation Conflict
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to modify data on the system.
The vulnerability exists due to fast-uri fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form while normalize() and equal() still return values that differ from a WHATWG-compatible URL parser. A remote attacker can trigger the vulnerability to modify data on the system.
2) Inefficient Algorithmic Complexity (CVE-ID: CVE-2026-13149)
CWE-ID: CWE-407 - Inefficient Algorithmic Complexity
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient algorithmic complexity in expand() when processing attacker-influenced brace expansion patterns containing consecutive non-expanding {} groups. A remote attacker can send a specially crafted input string to cause a denial of service.
The issue can block the calling thread for minutes or indefinitely with a small all-ASCII input, and applications using Node's single-threaded event loop may fully stall a worker or process.
Remediation
Install update from vendor's website.