CVE Explorer

CVE-2026-59898

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, ab attacker can force WebSocket upgrade via the lax V07 (or V08) handshaker by sending `Sec-WebSocket-Version: 7` and omitting `Connection: Upgrade` / `Upgrade: websocket` headers, completing a protocol switch that a proxy would not recognize as an Upgrade request and enabling HTTP request smuggling / protocol-confusion attacks. This issue has been fixed in versions 4.1.136.Fi

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e50db316ca4bc89ff7f40b8ad3628525460e2bfa37e635bba9415cab41715378

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"netty","vendor":"netty","versions":[{"status":"affected","version":">=4.2.0.Final, < 4.2.16.Final"},{"status":"affected","version":"< 4.1.136.Final"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:c15d939158251d585f3c3d5d502d5bfe0b8aa4f0758bc3c9fcbb5294909a9ab1 · sha256:38a657ebad78b13a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:c15d939158251d585f3c3d5d502d5bfe0b8aa4f0758bc3c9fcbb5294909a9ab1 · sha256:38a657ebad78b13a… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-444","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:c15d939158251d585f3c3d5d502d5bfe0b8aa4f0758bc3c9fcbb5294909a9ab1 · sha256:38a657ebad78b13a… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/netty/netty/releases/tag/netty-4.1.136.Final","tags":["x_refsource_MISC"],"url":"https://github.com/netty/netty/releases/tag/netty-4.1.136.Final"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:c15d939158251d585f3c3d5d502d5bfe0b8aa4f0758bc3c9fcbb5294909a9ab1 · sha256:38a657ebad78b13a… · /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:c15d939158251d585f3c3d5d502d5bfe0b8aa4f0758bc3c9fcbb5294909a9ab1 · sha256:38a657ebad78b13a… · /containers/cna/references/2

{"name":"https://github.com/netty/netty/security/advisories/GHSA-4mp9-239f-g9hg","tags":["x_refsource_CONFIRM"],"url":"https://github.com/netty/netty/security/advisories/GHSA-4mp9-239f-g9hg"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:c15d939158251d585f3c3d5d502d5bfe0b8aa4f0758bc3c9fcbb5294909a9ab1 · sha256:38a657ebad78b13a… · /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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