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CVE-2026-42530 is a use-after-free vulnerability in NGINX Open Source's ngx_http_v3_module, which implements HTTP/3 over QUIC. The flaw is triggered when a remote unauthenticated attacker sends a specially crafted HTTP/3 session that causes a QPACK encoder stream to be reopened after the associated memory has been freed. This results in dereferencing freed memory in the NGINX worker process. The issue affects deployments where HTTP/3 QUIC support is enabled and has been reported for NGINX Open Source versions 1.31.0 and 1.31.1. Successful exploitation can crash or restart the worker process, and in environments where ASLR is disabled or can be bypassed, the memory corruption may be leveraged for code execution in the context of the NGINX worker process.
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No valid public exploits. Mallory filtered out 4 candidates as fakes, detection scripts, or README-only repos.
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88 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in NGINX's HTTP/3 module reachable remotely without authentication via the QPACK encoder stream.
A use-after-free vulnerability in NGINX that could allow denial of service on affected systems.
A critical use-after-free vulnerability in NGINX's ngx_http_v3_module / HTTP/3 QUIC implementation that can be triggered remotely by an unauthenticated attacker, causing denial of service and potentially arbitrary code execution in less-hardened environments.
A critical use-after-free memory corruption vulnerability in NGINX HTTP/3/QPACK handling that can cause worker crashes and potentially remote code execution under favorable conditions such as ASLR being disabled or bypassed.
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Cross-references every affected SKU, including bundled OEM variants.
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