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CVE-2026-89044 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/netty/netty	[email protected]	Product
https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866	[email protected]	Product
https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c	[email protected]	Patch
https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585	[email protected]	Patch
https://github.com/netty/netty/releases/tag/netty-4.1.138.Final	[email protected]	Release Notes
https://github.com/netty/netty/releases/tag/netty-4.2.18.Final	[email protected]	Release Notes
https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c	[email protected]	ExploitVendor Advisory
https://www.vulncheck.com/advisories/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	[email protected]	PatchThird Party Advisory

see all 8 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-444	Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')	[email protected]

Affected Products

Product	Versions
netty netty	>= 4.1.133, < 4.1.138 >= 4.2.13, < 4.2.18
CPE cpe:2.3:a:netty:netty:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Sep 18, 2026	CVE Modified	CISA-ADP
Sep 16, 2026	Initial Analysis	[email protected]
Sep 10, 2026	New CVE Received	[email protected]