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CVE-2026-59919— Netty: HAProxy V1 Protocol CRLF Injection via AF_UNIX Address

Quick assessment

Affected
netty netty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netty是Netty团队开源的一款非阻塞I/O客户端-服务器框架,它主要用于开发Java网络应用程序,如协议服务器和客户端等。 Netty 4.1.136.Final之前版本和4.2.16.Final之前版本存在输入验证错误漏洞，该漏洞源于HAProxyMessageEncoder在将AF_UNIX地址写入HAProxy V1文本协议时未对CRLF字符进行验证，导致攻击者可通过注入\r\n序列分割PROXY头，从而伪造客户端源/目标IP，欺骗下游服务器或负载均衡器。

CVSS 5.5 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1557.002 · ARP Cache Poisoning

Affected Version Matrix 2

VendorProduct Version RangeStatus
netty netty < 4.1.136.Final affected
>= 4.2.0.Final, < 4.2.16.Final affected
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I. Basic Information for CVE-2026-59919

Vulnerability Information
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Vulnerability Title
Netty: HAProxy V1 Protocol CRLF Injection via AF_UNIX Address
Source: CVE Program / CVE List V5
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and destination socket addresses into the HAProxy V1 text protocol without validating them for CRLF characters, so an attacker who controls an AF_UNIX address can inject  \r\n  sequences and split the single PROXY header into multiple lines. This is possible because the V1 protocol uses CRLF as its line terminator and, unlike IPv4/IPv6 addresses whose format checks implicitly reject CRLF, AF_UNIX addresses are only validated for length (up to 108 bytes), allowing a forged second PROXY header line that spoofs the client source/destination IP to a downstream server or load balancer. The issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Netty 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netty是Netty团队开源的一款非阻塞I/O客户端-服务器框架,它主要用于开发Java网络应用程序,如协议服务器和客户端等。 Netty 4.1.136.Final之前版本和4.2.16.Final之前版本存在输入验证错误漏洞，该漏洞源于HAProxyMessageEncoder在将AF_UNIX地址写入HAProxy V1文本协议时未对CRLF字符进行验证，导致攻击者可通过注入\r\n序列分割PROXY头，从而伪造客户端源/目标IP，欺骗下游服务器或负载均衡器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
netty netty < 4.1.136.Final -

II. Public POCs for CVE-2026-59919

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III. Intelligence Information for CVE-2026-59919

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Vendor Advisories for CVE-2026-59919 (1)

Same Patch Batch · netty · 2026-07-29 · 6 CVEs total

CVE-2026-59901 8.7 HIGH Netty Bzip2Decoder: Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang
CVE-2026-59899 6.9 MEDIUM Netty HttpContentEncoder: Unbounded Per-Connection Queue Growth via HTTP/1.1 Pipelining Le
CVE-2026-59900 6.9 MEDIUM Netty codec-http2: Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads
CVE-2026-59920 6.5 MEDIUM Netty: STOMP CONNECT Frame Header Injection
CVE-2026-59898 6.3 MEDIUM Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-93