7.5

CVE-2026-45416

Netty: SNI handler pre-allocates up to 16 MiB from nine attacker bytes

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Netty ≫ Netty Version < 4.1.135
Netty ≫ Netty Version >= 4.2.0 < 4.2.15
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.46% 0.366
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

https://github.com/netty/netty/releases/tag/netty-4.1.135.Final
Release Notes
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
Release Notes
https://github.com/netty/netty/security/advisories/GHSA-x4gw-5cx5-pgmh
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:28573
https://access.redhat.com/errata/RHSA-2026:26586
https://access.redhat.com/errata/RHSA-2026:26017
https://access.redhat.com/errata/RHSA-2026:26018
https://access.redhat.com/security/cve/CVE-2026-45416
https://bugzilla.redhat.com/show_bug.cgi?id=2488391
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45416.json
https://access.redhat.com/errata/RHSA-2026:34608