SB2026081984 - Resource exhaustion in Hyperium H2

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Main Vulnerability Database SB2026081984

SB2026081984 - Resource exhaustion in Hyperium H2

Published: August 19, 2026

Security Bulletin ID SB2026081984
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Resource exhaustion (CVE-ID: N/A)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 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]


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.


Remediation

Install update from vendor's website.

References