Allocation of Resources Without Limits or Throttling in Netty - #VU148886
Published: September 10, 2026
Vulnerability identifier: #VU148886
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 the QpackEncoder streamSectionTrackers map when processing HTTP/3 response field sections while a peer withholds Section Acknowledgments. A remote attacker can sequentially complete requests and omit Section Acknowledgments to cause a denial of service.
The server must emit at least one repeatable, non-sensitive response header eligible for QPACK dynamic indexing.
Affected software
Netty
Remediation
Install security update from vendor's website.
Netty - update to 4.2.18