Resource exhaustion in H2 - #VU144332
Published: August 19, 2026
Vulnerability identifier: #VU144332
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-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 the h2 DATA frame handling logic when processing large numbers of empty DATA frames on undrained HTTP/2 streams. A remote attacker can send large numbers of empty DATA frames to cause a denial of service.
Exploitation requires the application to use HTTP/2 and to not fully drain incoming request or response bodies.
Affected software
H2
Remediation
Install security update from vendor's website.
H2 - update to 0.4.16