CVE-2026-45416

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, SslClientHelloHandler.decode() reads the 24-bit TLS handshake length and, when the ClientHello does not fit in the first record, eagerly allocates `ctx.alloc().buffer(handshakeLength)` (line 161). The guard at line 140 is `handshakeLength > maxClientHelloLength && maxClientHelloLength != 0`, and the commonly-used SniHandler/AbstractSniHandler constructors (SniHandler(Mapping), SniHandler(AsyncMapping), AbstractSniHandler()) pass maxClientHelloLength=0 and handshakeTimeoutMillis=0, so the length guard is disabled and no timeout is scheduled. A 16 MiB request exceeds the default pooled chunk size and becomes a huge/unpooled allocation performed immediately. The buffer is retained in the handler until the channel closes. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
Configurations

Configuration 1 (hide)

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

History

18 Sep 2026, 13:18

Type Values Removed Values Added
References
  • {'url': 'https://access.redhat.com/errata/RHSA-2026:53806', 'source': '0b0ca135-0b70-47e7-9f44-1890c2a1c46c'}
  • () https://access.redhat.com/errata/RHSA-2026:53645 -
  • () https://access.redhat.com/errata/RHSA-2026:53646 -

Information

Published : 2026-06-12 15:16

Updated : 2026-09-18 13:18


NVD link : CVE-2026-45416

Mitre link : CVE-2026-45416

CVE.ORG link : CVE-2026-45416


JSON object : View

Products Affected

netty

  • netty
CWE
CWE-770

Allocation of Resources Without Limits or Throttling