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CVE-2026-59920— Netty: STOMP CONNECT Frame Header Injection

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STOMP编码器未对CONNECT和CONNECTED帧中的标头值进行转义或验证，导致原始换行字符直接写入，攻击者可通过控制标头值注入额外STOMP标头，从而覆盖连接参数或添加认证/角色头，可能绕过身份验证或提升权限。

CVSS 6.5 · Medium EPSS 0.41% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-59920

Vulnerability Information
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Vulnerability Title
Netty: STOMP CONNECT Frame Header Injection
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 STOMP encoder ( StompSubframeEncoder ) does not escape or validate header values in  CONNECT  and  CONNECTED  frames, so raw newline ( \n ) characters in a header value are written directly to the wire, allowing an attacker who controls a header value to inject additional STOMP headers. This happens because the encoder intentionally skips escaping for CONNECT/CONNECTED frames per the STOMP 1.2 specification but never rejects the raw newlines, and since a broker parses each line as a separate header, an attacker controlling a value such as a user-supplied login or passcode can overwrite connection parameters or add authentication/role headers to bypass authentication or escalate privileges (the actual impact is broker-dependent). 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:N/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STOMP编码器未对CONNECT和CONNECTED帧中的标头值进行转义或验证，导致原始换行字符直接写入，攻击者可通过控制标头值注入额外STOMP标头，从而覆盖连接参数或添加认证/角色头，可能绕过身份验证或提升权限。
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-2026-59920

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III. Intelligence Information for CVE-2026-59920

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Vendor Advisories for CVE-2026-59920 (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-2026-59898 6.3 MEDIUM Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation
CVE-2026-59919 5.5 MEDIUM Netty: HAProxy V1 Protocol CRLF Injection via AF_UNIX Address

IV. Related Vulnerabilities

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