Vulnerability Details CVE-2026-56816
Netty is a network application framework for development of protocol servers and clients. Prior to 4.2.16.Final, Netty's `Http3FrameCodec` buffers incoming data for HTTP/3 reserved frame types up to the wire-specified payload length without limits; `decodeFrame` trusts `payLoadLength`, allowing an attacker to open multiple QUIC streams and send reserved frames with very large payload lengths to cause memory exhaustion and denial of service. This issue is fixed in version 4.2.16.Final.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 43.3%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-56816
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cpe:2.3:a:netty:netty:4.2.10
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cpe:2.3:a:netty:netty:4.2.11
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cpe:2.3:a:netty:netty:4.2.12
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cpe:2.3:a:netty:netty:4.2.13
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cpe:2.3:a:netty:netty:4.2.14
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cpe:2.3:a:netty:netty:4.2.15
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cpe:2.3:a:netty:netty:4.2.2
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cpe:2.3:a:netty:netty:4.2.3
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cpe:2.3:a:netty:netty:4.2.4
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cpe:2.3:a:netty:netty:4.2.5
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cpe:2.3:a:netty:netty:4.2.6
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cpe:2.3:a:netty:netty:4.2.7
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cpe:2.3:a:netty:netty:4.2.8
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cpe:2.3:a:netty:netty:4.2.9