CVE-2026-40460 NGINX ngx_quic_module vulnerability
Attackers can spoof source IPs in NGINX HTTP/3 QUIC configurations to bypass authorization and rate limiting controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40460?
CVE-2026-40460 is a medium-severity authentication bypass vulnerability in F5 NGINX Open Source, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to spoof their source IP address allowing for bypass of authorization or bypass of rate limiting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Weakness: CWE-290
Which versions are affected by CVE-2026-40460?
2 open source packages ship an affected version, including nginx and nginx-gateway. It affects 7 products.
| Package | Affected | Fixed in |
|---|---|---|
nginx Bitnami | From 1.26.0 | 1.30.1 |
nginx-gateway Bitnami | From 1.26.0 | 1.30.1 |
Products include F5 Dos, F5 Nginx Gateway Fabric, F5 Nginx Ingress Controller, F5 Nginx Instance Manager, F5 Nginx Open Source, F5 Nginx Plus and 1 more.
How do I fix CVE-2026-40460?
Upgrade nginx to 1.30.1 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-40460 being exploited?
There is no known exploitation of CVE-2026-40460 in the wild and no public exploit code.
Other vulnerabilities in F5 NGINX Open Source
- CVE-2026-42055 NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability
- CVE-2026-42945 NGINX ngx_http_rewrite_module vulnerability
- CVE-2026-42946 NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability
- CVE-2026-48142 NGINX ngx_http_charset_module vulnerability
- CVE-2026-40701 NGINX ngx_http_ssl_module vulnerability
Sources
Also known as ALPINE-CVE-2026-40460, AZL-86847, BELL-CVE-2026-40460, BIT-nginx-2026-40460, BIT-nginx-gateway-2026-40460, DEBIAN-CVE-2026-40460 and 8 more.