// For flags

CVE-2026-33870

Netty: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, Netty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks. Versions 4.1.132.Final and 4.2.10.Final fix the issue.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
Poc
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2026-03-24 CVE Reserved
  • 2026-03-27 CVE Published
  • 2026-03-31 CVE Updated
  • 2026-03-31 First Exploit
  • 2026-05-08 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Netty
Search vendor "Netty"
 Netty
Search vendor "Netty" for product "Netty"
 < 4.1.132
Search vendor "Netty" for product "Netty" and version " < 4.1.132"
-
Affected
Netty
Search vendor "Netty"
 Netty
Search vendor "Netty" for product "Netty"
 >= 4.2.0 < 4.2.10
Search vendor "Netty" for product "Netty" and version " >= 4.2.0 < 4.2.10"
-
Affected