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CVE-2026-59901— Netty Bzip2Decoder: Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang

CVSS 8.7 · High EPSS 0.25% · P16

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProductVersion RangeStatus
nettynetty>=4.2.0.Final, < 4.2.16.Finalaffected
< 4.1.136.Finalaffected
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I. Basic Information for CVE-2026-59901

Vulnerability Information
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Vulnerability Title
Netty Bzip2Decoder: Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang
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, the `Bzip2Decoder` handler in Netty's compression codec pipeline is vulnerable to a denial-of-service attack through a malformed bzip2 stream that permanently captures the event-loop thread in an infinite loop. The vulnerability exists in the run-length encoding (RLE) state machine within [`Bzip2BlockDecompressor.read()`]. 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:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Netty 资源管理错误漏洞
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之前版本存在资源管理错误漏洞，该漏洞源于压缩编解码器管道中的Bzip2Decoder处理器存在缺陷，通过畸形的bzip2流导致事件循环线程陷入无限循环，容易受到拒绝服务攻击。
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

VendorProductAffected VersionsCPESubscribe
nettynetty >=4.2.0.Final, < 4.2.16.Final -

II. Public POCs for CVE-2026-59901

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 6978 chars
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III. Intelligence Information for CVE-2026-59901

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Vendor Advisories for CVE-2026-59901 (1)

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

CVE-2026-598996.9 MEDIUMNetty HttpContentEncoder: Unbounded Per-Connection Queue Growth via HTTP/1.1 Pipelining Le
CVE-2026-599006.9 MEDIUMNetty codec-http2: Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads
CVE-2026-599206.5 MEDIUMNetty: STOMP CONNECT Frame Header Injection
CVE-2026-598986.3 MEDIUMNetty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation
CVE-2026-599195.5 MEDIUMNetty: HAProxy V1 Protocol CRLF Injection via AF_UNIX Address

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-835

V. Comments for CVE-2026-59901

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