CVE-2026-42581

Published: Mag 13, 2026 Last Modified: Mag 18, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 5,8
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: changed
Confidentiality: none
Integrity: low
Availability: none

Description

AI Translation Available

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundaries, enabling request smuggling. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0003
Percentile
0,1th
Updated

EPSS Score Trend (Last 7 Days)

444

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

Incomplete
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Non-Repudiation Access Control
Potential Impacts:
Unexpected State Hide Activities Bypass Protection Mechanism
Applicable Platforms
Technologies: Web Based, Web Server
View CWE Details
Application

Netty by Netty

Product Information
Vendor Netty
Product Netty
Version Range Affected
From 4.2.0 (inclusive)
To 4.2.13 (exclusive)
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Netty by Netty

Product Information
Vendor Netty
Product Netty
Version Range Affected
To 4.1.133 (exclusive)
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/netty/netty/security/advisories/GHSA-xxq…
https://github.com/netty/netty/security/advisories/GHSA-xxqh-mfjm-7mv9
https://github.com/netty/netty/security/advisories/GHSA-xxq…
https://github.com/netty/netty/security/advisories/GHSA-xxqh-mfjm-7mv9