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CVE-2026-90439 is a heap-based buffer overflow vulnerability in the ngx_http_v3_module of NGINX Plus and NGINX Open Source when using HTTP/3 with OpenSSL versions up to 3.5.0. This flaw may cause the NGINX worker process to restart or experience limited data corruption. The issue is a data plane vulnerability without control plane exposure. It affects specific versions of NGINX Plus and NGINX Open Source and has a medium severity rating. Join the discussion | CVE Database V5 | 09/15/2026, 14:27:26 UTC Added: 09/15/2026, 15:02:20 UTC |
0 When NGINX Plus is configured to use the Message Queuing Telemetry Transport (MQTT) filter module (ngx_stream_mqtt_filter_module), unauthenticated attackers can send requests with conditions beyond the attacker's control to cause a heap buffer over-read in the NGINX worker process, leading to a restart. Impact: This vulnerability may allow remote unauthenticated attackers to have limited control to restart the NGINX worker process. 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. Join the discussion | CVE Database V5 | 07/15/2026, 14:33:46 UTC Added: 07/15/2026, 14:48:46 UTC |
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