Detections
Analytics
SCA: security update for io.netty:netty-codec-haproxy (GHSA-q6cq-mhr2-jmr5)
high Tenable Cloud Security Plugin ID 445206
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- Netty is a network application framework for development of protocol servers and clients. In versions
4.2.0.Final up to (but not including) 4.2.16.Final, and 4.1.0.Final up to (but not including) 4.1.135, the
`HAProxyMessageDecoder` in Netty's `codec-haproxy` module performs protocol version detection by reading
the 13th byte as a signed Java `byte` and widening it to `int` without masking; a PROXY protocol v2 binary
prefix followed by version byte `0xFF` sign-extends to `-1`, collides with the decoder's need-more-data
sentinel, and causes `ByteToMessageDecoder` to accumulate inbound bytes in an unbounded `cumulation`
buffer until direct memory is exhausted. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
(CVE-2026-55851)
Solution
Update the io.netty:netty-codec-haproxy library and its related packages to version 4.1.136.Final or later.See Also
Plugin Details
Severity: High
ID: 445206
Version: Revision 1.1
Type: Local
Family: SCA Checks
Published: 7/23/2026
Updated: 7/23/2026
Risk Information
VPR
Risk Factor: Medium
Score: 4.3
Percentile: 53.63
Vendor
Vendor Severity: High
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2026-55851
CVSS v3
Risk Factor: Critical
Base Score: 9.1
Temporal Score: 7.9
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: High
Base Score: 8.7
Threat Score: 6.6
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
Exploit Ease: No known exploits are available
Patch Publication Date: 7/22/2026
Vulnerability Publication Date: 7/21/2026
Reference Information
CVE: CVE-2026-55851
cwe: CWE-400