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Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 31.5%
CVSS Severity
CVSS v3 Score 6.5
Products affected by CVE-2026-42580
  • Netty » Netty » Version: 4.2.0
    cpe:2.3:a:netty:netty:4.2.0
  • Netty » Netty » Version: 4.2.1
    cpe:2.3:a:netty:netty:4.2.1
  • Netty » Netty » Version: 4.2.10
    cpe:2.3:a:netty:netty:4.2.10
  • Netty » Netty » Version: 4.2.11
    cpe:2.3:a:netty:netty:4.2.11
  • Netty » Netty » Version: 4.2.12
    cpe:2.3:a:netty:netty:4.2.12
  • Netty » Netty » Version: 4.2.2
    cpe:2.3:a:netty:netty:4.2.2
  • Netty » Netty » Version: 4.2.3
    cpe:2.3:a:netty:netty:4.2.3
  • Netty » Netty » Version: 4.2.4
    cpe:2.3:a:netty:netty:4.2.4
  • Netty » Netty » Version: 4.2.5
    cpe:2.3:a:netty:netty:4.2.5
  • Netty » Netty » Version: 4.2.6
    cpe:2.3:a:netty:netty:4.2.6
  • Netty » Netty » Version: 4.2.7
    cpe:2.3:a:netty:netty:4.2.7
  • Netty » Netty » Version: 4.2.8
    cpe:2.3:a:netty:netty:4.2.8
  • Netty » Netty » Version: 4.2.9
    cpe:2.3:a:netty:netty:4.2.9


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