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CVE-2026-42580

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9fd32be9f956924a6153335a5c63c418dafffe26ae566e809ec04009a25f08cb
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"netty","vendor":"netty","versions":[{"status":"affected","version":">= 4.2.0.Alpha1, < 4.2.13.Final"},{"status":"affected","version":"< 4.1.133.Final"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /containers/cna/affected/0

{"product":"netty-codec-http","vendor":"io.netty","versions":[{"status":"affected","version":">= 4.2.0.Alpha1, < 4.2.13.Final"},{"status":"affected","version":"< 4.1.133.Final"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /containers/cna/affected/1
cwe · 2 assertions

{"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:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

2 source assertions
{"product":"netty","vendor":"netty","versions":[{"status":"affected","version":">= 4.2.0.Alpha1, < 4.2.13.Final"},{"status":"affected","version":"< 4.1.133.Final"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /containers/cna/affected/0
{"product":"netty-codec-http","vendor":"io.netty","versions":[{"status":"affected","version":">= 4.2.0.Alpha1, < 4.2.13.Final"},{"status":"affected","version":"< 4.1.133.Final"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"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:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /containers/adp/0/references/0
{"name":"https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723","tags":["x_refsource_CONFIRM"],"url":"https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:78474516ee4e93c29f977960b15a27e57aae27b72ce9441593ded05d03a1ba5d · sha256:532a55a526497e65… · /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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