Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| F5 | Nginx Gateway Fabric | >= 1.3.0, <= 1.6.2 |
| F5 | Nginx Ingress Controller | >= 3.5.0, <= 3.7.2 |
| F5 | Nginx Instance Manager | >= 2.17.0, <= 2.22.0 |
| F5 | Nginx Open Source | >= 1.31.0, < 1.31.2 |
Related Weaknesses (CWE)
References
- https://my.f5.com/manage/s/article/K000161616Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:20351
- https://access.redhat.com/security/cve/CVE-2026-42530Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2489872Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42530.jsonThird Party Advisory
FAQ
What is CVE-2026-42530?
CVE-2026-42530 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 beyo...
How severe is CVE-2026-42530?
CVE-2026-42530 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42530?
Check the references section above for vendor advisories and patch information. Affected products include: F5 Nginx Gateway Fabric, F5 Nginx Ingress Controller, F5 Nginx Instance Manager, F5 Nginx Open Source.