CVE-2026-33871

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of `CONTINUATION` frames. The server's lack of a limit on the number of `CONTINUATION` frames, combined with a bypass of existing size-based mitigations using zero-byte frames, allows an user to cause excessive CPU consumption with minimal bandwidth, rendering the server unresponsive. Versions 4.1.132.Final and 4.2.10.Final fix the issue.
Configurations

Configuration 1 (hide)

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

History

03 Jul 2026, 13:17

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:34608 -

30 Jun 2026, 03:18

Type Values Removed Values Added
References
  • () https://access.redhat.com/errata/RHSA-2026:10175 -
  • () https://access.redhat.com/errata/RHSA-2026:10184 -
  • () https://access.redhat.com/errata/RHSA-2026:13571 -
  • () https://access.redhat.com/errata/RHSA-2026:14272 -
  • () https://access.redhat.com/errata/RHSA-2026:14276 -
  • () https://access.redhat.com/errata/RHSA-2026:17668 -
  • () https://access.redhat.com/errata/RHSA-2026:17789 -
  • () https://access.redhat.com/errata/RHSA-2026:18054 -
  • () https://access.redhat.com/errata/RHSA-2026:18055 -
  • () https://access.redhat.com/errata/RHSA-2026:18059 -
  • () https://access.redhat.com/errata/RHSA-2026:22619 -
  • () https://access.redhat.com/errata/RHSA-2026:7109 -
  • () https://access.redhat.com/errata/RHSA-2026:7380 -
  • () https://access.redhat.com/errata/RHSA-2026:8159 -
  • () https://access.redhat.com/errata/RHSA-2026:8509 -
  • () https://access.redhat.com/security/cve/CVE-2026-33871 -
  • () https://bugzilla.redhat.com/show_bug.cgi?id=2452456 -
  • () https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33871.json -

30 Mar 2026, 20:10

Type Values Removed Values Added
References () https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv - () https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv - Vendor Advisory
CPE cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
First Time Netty netty
Netty
CVSS v2 : unknown
v3 : unknown
v2 : unknown
v3 : 7.5

27 Mar 2026, 20:16

Type Values Removed Values Added
New CVE

Information

Published : 2026-03-27 20:16

Updated : 2026-08-04 13:18


NVD link : CVE-2026-33871

Mitre link : CVE-2026-33871

CVE.ORG link : CVE-2026-33871


JSON object : View

Products Affected

netty

  • netty
CWE
CWE-770

Allocation of Resources Without Limits or Throttling