Missing Release of Resource after Effective Lifetime in Netty - CVE-2026-42577
Published: May 5, 2026
Vulnerability identifier: #VU130209
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-2026-42577
CWE-ID: CWE-772
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 missing release of resource after effective lifetime in the Netty epoll transport when processing a TCP connection that receives a RST after being half-closed. A remote attacker can send a FIN followed by a RST to cause a denial of service.
Exploitation requires ALLOW_HALF_CLOSURE to be enabled or the connection to enter a half-closed state via the HTTP codec.
Remediation
Install security update from vendor's website.