Resource exhaustion in Netty - CVE-2026-44892
Published: June 8, 2026
Vulnerability identifier: #VU133455
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-2026-44892
CWE-ID: CWE-400
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 uncontrolled resource consumption in Http3ConnectionHandler and Http3FrameCodec when processing HTTP/3 header fields without an enforced maximum header size limit. A remote attacker can send an enormous number of headers to cause a denial of service.
The issue occurs when a peer does not explicitly specify HTTP3_SETTINGS_MAX_FIELD_SECTION_SIZE, causing the implementation to use an unbounded default limit and potentially crash with an OutOfMemoryError.
Affected software
Netty
How to mitigate CVE-2026-44892
Install security update from vendor's website.
Netty - update to 4.2.15