CVE-2026-89044

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-89044
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.

6.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/netty/netty 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 Product
https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c Patch
https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585 Patch
https://github.com/netty/netty/releases/tag/netty-4.1.138.Final Release Notes
https://github.com/netty/netty/releases/tag/netty-4.2.18.Final Release Notes
https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c Vendor Advisory Exploit
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 Patch Third Party Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
History

16 Sep 2026, 16:06

Type Values Removed Values Added
First Time Netty
Netty netty
CPE cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
References () https://github.com/netty/netty - () https://github.com/netty/netty - Product
References () https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866 - () https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866 - Product
References () https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c - () https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c - Patch
References () https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585 - () https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585 - Patch
References () https://github.com/netty/netty/releases/tag/netty-4.1.138.Final - () https://github.com/netty/netty/releases/tag/netty-4.1.138.Final - Release Notes
References () https://github.com/netty/netty/releases/tag/netty-4.2.18.Final - () https://github.com/netty/netty/releases/tag/netty-4.2.18.Final - Release Notes
References () https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c - () https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c - Vendor Advisory, Exploit
References () 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 - () 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 - Patch, Third Party Advisory
Information

Published : 2026-09-10 18:18

Updated : 2026-09-16 16:06

NVD link : CVE-2026-89044

Mitre link : CVE-2026-89044

CVE.ORG link : CVE-2026-89044

JSON object : View

Products Affected

netty

  • netty
CWE
CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')