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CVE-2026-59898— Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation

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WebSocket升级处理不当，可能导致攻击者实现HTTP请求夹带/协议混淆攻击。

CVSS 6.3 · Medium EPSS 0.44% · P36

Affected Version Matrix 2

VendorProduct Version RangeStatus
netty netty >=4.2.0.Final, < 4.2.16.Final affected
< 4.1.136.Final affected
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I. Basic Information for CVE-2026-59898

Vulnerability Information
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Vulnerability Title
Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation
Source: CVE Program / CVE List V5
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, ab attacker can force WebSocket upgrade via the lax V07 (or V08) handshaker by sending `Sec-WebSocket-Version: 7` and omitting `Connection: Upgrade` / `Upgrade: websocket` headers, completing a protocol switch that a proxy would not recognize as an Upgrade request and enabling HTTP request smuggling / protocol-confusion attacks. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
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WebSocket升级处理不当，可能导致攻击者实现HTTP请求夹带/协议混淆攻击。
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 >=4.2.0.Final, < 4.2.16.Final -

II. Public POCs for CVE-2026-59898

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III. Intelligence Information for CVE-2026-59898

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Vendor Advisories for CVE-2026-59898 (1)

Vendor Pages for CVE-2026-59898 (2)

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-2026-59919 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-444

V. Comments for CVE-2026-59898

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