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CVE-2026-89044— Netty 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final HTTP Request Smuggling via Transfer-Encoding

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团队开源的一个高性能网络通信框架。 Netty 4.1.133.Final版本至4.1.137.Final版本和4.2.13.Final版本至4.2.17.Final版本存在输入验证错误漏洞，该漏洞源于未正确验证Transfer-Encoding标头中的最终传输编码，可能通过将Transfer-Encoding标头拆分到多行或使用'chunked, xchunked'等畸形编码声明绕过验证，导致HTTP请求夹带攻击。

CVSS 6.5 · Medium EPSS 0.28% · P21

Affected Version Matrix 2

VendorProduct Version RangeStatus
netty netty 4.1.133.Final< 4.1.138.Final affected
4.2.13.Final< 4.2.18.Final affected
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I. Basic Information for CVE-2026-89044

Vulnerability Information
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Vulnerability Title
Netty 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final HTTP Request Smuggling via Transfer-Encoding
Source: CVE Program / CVE List V5
Vulnerability Description
Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A: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团队开源的一个高性能网络通信框架。 Netty 4.1.133.Final版本至4.1.137.Final版本和4.2.13.Final版本至4.2.17.Final版本存在输入验证错误漏洞，该漏洞源于未正确验证Transfer-Encoding标头中的最终传输编码，可能通过将Transfer-Encoding标头拆分到多行或使用'chunked, xchunked'等畸形编码声明绕过验证，导致HTTP请求夹带攻击。
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 4.1.133.Final ~ 4.1.138.Final -

II. Public POCs for CVE-2026-89044

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III. Intelligence Information for CVE-2026-89044

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Patches & Fixes for CVE-2026-89044 (3)

Vendor Advisories for CVE-2026-89044 (2)

Proof of Concept for CVE-2026-89044 (1)

Vendor Pages for CVE-2026-89044 (1)

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-444