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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 4.1.133.Final 至 4.1.137.Final 以及 4.2.13.Final 至 4.2.17.Final 版本未能正确验证 Transfer-Encoding 请求头中的最终传输编码，使得攻击者可以利用格式错误的编码声明进行请求走私（Request Smuggling）。攻击者可以将 Transfer-Encoding 请求头拆分到多行，或使用如 "chunked, xchunked" 这样的值来绕过验证，并在最终编码不是 chunked 的情况下，将消息解码为 chunked 编码，从

CVSS 6.5 · Medium EPSS 0.25% · P16

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

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

# POC Description Source Link Shenlong Link
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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

V. Comments for CVE-2026-89044

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