Allocation of Resources Without Limits or Throttling in Netty - CVE-2026-100656
Published: September 10, 2026 / Updated: September 28, 2026
Vulnerability identifier: #VU148878
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-100656
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in HttpServerCodec's methodOverflowQueue when processing pipelined HTTP/1.1 requests while responses remain unread. A remote attacker can pipeline a large number of requests and withhold reads from the connection to cause a denial of service.
Affected software
Netty
How to mitigate CVE-2026-100656
Install security update from vendor's website.
Netty - addressed in versions 4.1.138, 4.2.18