NGINX
CVE-2026-90439: NGINX ngx_http_v3_module vulnerability
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| NGINX Plus 37.1 | 37.1.1.2 or later |
| NGINX Plus 37.0 | 37.0.6.2 or later |
| NGINX Open Source 1.29 | 1.31.6 or later |
| NGINX Open Source 1.30 | 1.30.5 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption.
Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. There is no control plane exposure; this is a data plane issue only.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Workarounds
Disable HTTP/3 by removing "quic" from the "listen" directive. Alternatively, enable HTTP/3 by adding "quic" to all configured server blocks.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 12 Oct 2026.