Allocation of Resources Without Limits or Throttling in Netty - CVE-2026-42583
Published: May 5, 2026
Vulnerability identifier: #VU130206
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-42583
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Netty
Netty
Software vendor:
Netty project
Netty project
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in io.netty.handler.codec.compression.Lz4FrameDecoder#decode when processing crafted LZ4 frames. A remote attacker can send a specially crafted compressed frame header and payload to cause a denial of service.
On the compressed path, header fields are trusted for sizing, allowing a small request to force allocation of a much larger ByteBuf.
Remediation
Install security update from vendor's website.