CVE-2026-42580
Netty: HTTP Request Smuggling due to incorrect chunk size parsing
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-444 CWE-190 |
| Vendor | netty |
| Product | netty |
| Published | May 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Affected Versions
netty / netty
>= 4.2.0.Alpha1, < 4.2.13.Final < 4.1.133.Final
io.netty / netty-codec-http
>= 4.2.0.Alpha1, < 4.2.13.Final < 4.1.133.Final