CVE-2026-42585CWE-444

Netty: HTTP Request Smuggling due to malformed Transfer-Encoding

Medium · published May 13, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
20.7
In the wild
Unconfirmed
What it is

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00293 · 20.7th percentile
Weakness
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Published
2026-05-13T18:12Z
EPSS history
Timeline
  • 13 MAY 18:12Z
    Netty: HTTP Request Smuggling due to malformed Transfer-Encoding
    cvelistv5