Is CVE-2026-45416 actively exploited?

No active exploitation of CVE-2026-45416 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45416 be exploited remotely?

Yes. CVE-2026-45416 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-45416?

CVE-2026-45416 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-45416

HIGH

CVE-2026-45416

CWE-770Published: June 12, 2026· Updated: Jun 17, 2026

7.5

CVSS v3.1

EPSS:0.61%probability of exploitation in 30 daysPercentile:44.3th

Official 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, 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.

NVD Source

Technical Analysis

CVE-2026-45416 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.