CVE-2026-90439

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.

Score

CVSS 4.0 6.9 Medium

Status

Awaiting Analysis - f5sirt@f5.com

Published

2026-09-15

Last modified

2026-09-16

Weaknesses

CWE-122

Affected products

• Nginx Open Source (F5)
• Nginx Plus (F5)

References

• https://my.f5.com/manage/s/article/K000162604