CVE-2026-50560 Details
Description
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty HTTP/2 max header size handling produces an attack similar to HTTP/2 Rapid Reset. There is a setting in the http2 specification called `SETTINGS_MAX_HEADER_LIST_SIZE`. When a client sends that setting to Netty, it appears that Netty will behave as follows: read the request; proxy the request to the origin; attempt to produce a response; and create an exception while writing the headers for the response. Functionally, this should be similar to the http2 reset attack, but with a different on-the-wire signature. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
A denial-of-service vulnerability has been identified in Netty's HTTP/2 handling, specifically in versions prior to 4.1.135.Final and 4.2.15.Final. The issue arises from how Netty processes the 'SETTINGS_MAX_HEADER_LIST_SIZE' setting, which clients can use to indicate the maximum size of header fields they are willing to accept. When this setting is received, Netty reads the request, proxies it to the origin, and attempts to send a response. However, an exception is triggered while writing the response headers, creating a situation similar to the HTTP/2 Rapid Reset attack, but with a different signature on the wire.
Users can upgrade to Netty versions 4.1.135.Final or 4.2.15.Final, both of which include the necessary fix.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 13, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| netty netty | < 4.1.135 >= 4.2.0, < 4.2.15 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 15, 2026 | Initial Analysis | [email protected] |
| Jun 12, 2026 | New CVE Received | [email protected] |