Allocation of Resources Without Limits or Throttling in Netty - #VU148877
Published: September 10, 2026
Vulnerability identifier: #VU148877
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: N/A
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 SpdySessionHandler when processing remote-initiated SYN_STREAM frames. A remote attacker can send millions of SYN_STREAM frames with FLAG_FIN=0 to cause a denial of service.
Affected software
Netty
Remediation
Install security update from vendor's website.
Netty - addressed in versions 4.1.138, 4.2.18