========================================================================== Ubuntu Security Notice USN-7892-1 November 26, 2025
h2o vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
Summary:
H2O could be made to crash if it received specially crafted network traffic.
Software Description:
- h2o: the optimized HTTP/1, HTTP/2 server
Details:
It was discovered that H2O exhibited poor server resource management in its
HTTP/2 protocol. An attacker could possibly use this issue to cause H2O to
crash, resulting in a denial of service.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS
h2o 2.2.5+dfsg2-6.1ubuntu2+esm1
Available with Ubuntu Pro
libh2o0.13 2.2.5+dfsg2-6.1ubuntu2+esm1
Available with Ubuntu Pro
Ubuntu 20.04 LTS
h2o 2.2.5+dfsg2-3ubuntu0.1~esm1
Available with Ubuntu Pro
libh2o0.13 2.2.5+dfsg2-3ubuntu0.1~esm1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-7892-1
CVE-2023-44487
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