Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
netty netty
Exploitation
Public or AI PoC available; prioritize validation
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。

CVSS 8.7 · High EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
netty netty >=4.2.0.Final, < 4.2.16.Final affected
< 4.1.136.Final affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-59901

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

Vendor Product Affected Versions CPE Subscribe
netty netty >=4.2.0.Final, < 4.2.16.Final -

II. Public POCs for CVE-2026-59901

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6978 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-59901

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-59901 (1)

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

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
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-835

V. Comments for CVE-2026-59901

No comments yet

Leave a comment