CVE Explorer

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.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ff06f4440b5d8a564039a6056e7281759284b1bd43f9eda53d9abb889d869d51

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"netty","vendor":"netty","versions":[{"status":"affected","version":"< 4.2.16.Final"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:2f8101611462a58572c096ce37a16c07319ea7a10e26640cbaeda93cd4e144f9 · sha256:b64681c632a60133… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:2f8101611462a58572c096ce37a16c07319ea7a10e26640cbaeda93cd4e144f9 · sha256:b64681c632a60133… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:2f8101611462a58572c096ce37a16c07319ea7a10e26640cbaeda93cd4e144f9 · sha256:b64681c632a60133… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b","tags":["x_refsource_MISC"],"url":"https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:2f8101611462a58572c096ce37a16c07319ea7a10e26640cbaeda93cd4e144f9 · sha256:b64681c632a60133… · /containers/cna/references/1

{"name":"https://github.com/netty/netty/releases/tag/netty-4.2.16.Final","tags":["x_refsource_MISC"],"url":"https://github.com/netty/netty/releases/tag/netty-4.2.16.Final"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:2f8101611462a58572c096ce37a16c07319ea7a10e26640cbaeda93cd4e144f9 · sha256:b64681c632a60133… · /containers/cna/references/2

{"name":"https://github.com/netty/netty/security/advisories/GHSA-hpcc-26xq-25fv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/netty/netty/security/advisories/GHSA-hpcc-26xq-25fv"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:2f8101611462a58572c096ce37a16c07319ea7a10e26640cbaeda93cd4e144f9 · sha256:b64681c632a60133… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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