CVE-2026-42530
8.1 · HIGHOverview
CVE-2026-42530 is a high-severity vulnerability affecting f5 nginx_gateway_fabric. It was published on June 17, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Remediation
Check the references section for vendor advisories and patches from f5. Update nginx_gateway_fabric to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| f5 | nginx_gateway_fabric | 1.3.0 | Affected |
| f5 | nginx_ingress_controller | 3.5.0 | Affected |
| f5 | nginx_instance_manager | 2.17.0 | Affected |
| f5 | nginx_open_source | >= 1.31.0, < 1.31.2 | Affected |
Frequently Asked Questions
What is CVE-2026-42530?
CVE-2026-42530 is a high-severity vulnerability affecting f5 nginx_gateway_fabric. It was published on June 17, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2026-42530?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-42530?
Check the references section for vendor advisories and patches from f5. Update nginx_gateway_fabric to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-42530?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-42530 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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