CVE-2026-33870

HIGH EPSS 36.4%
Published Mar 27, 20263mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Mar 27, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
36.4% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-444

Affected Products 2

VendorProductVersionRange
nettynetty* <4.1.132
nettynetty*≥4.2.0  –  <4.2.10

References 4

  • github.com https://github.com/netty/netty/security/advisories/GHSA-pwqr-wmgm-9rr8
    ExploitMitigationVendor Advisory
  • w4ke.info https://w4ke.info/2025/06/18/funky-chunks.html
    Technical Description
  • w4ke.info https://w4ke.info/2025/10/29/funky-chunks-2.html
    Technical Description
  • rfc-editor.org https://www.rfc-editor.org/rfc/rfc9110
    Technical Description

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.