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F5 Patches Two Critical NGINX Open Source Flaws Enabling Remote Code Execution F5 released out-of-band security updates for two critical NGINX vulnerabilities — CVE-2026-42530 (CVSS 9.2), a use-after-free flaw in the HTTP/3 QUIC module, and CVE-2026-42055 (CVSS 9.2), a heap-based buffer overflow in the HTTP/2 proxy and gRPC modules — both exploitable by unauthenticated remote […] The post appeared first on .

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