CVE-2026-14684 HdrHistogram AbstractHistogram.java memory allocation
Local attackers can cause denial of service via uncontrolled memory allocation in HdrHistogram's decodeFromByteBuffer function.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-14684?
CVE-2026-14684 is a medium-severity denial of service vulnerability in HdrHistogram, published on 4 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw has been found in HdrHistogram up to 2.2.2. This affects the function org.HdrHistogram.AbstractHistogram.decodeFromByteBuffer of the file src/main/java/org/HdrHistogram/AbstractHistogram.java. This manipulation of the argument numberOfSignificantValueDigits causes uncontrolled memory allocation. The attack can only be executed locally. The exploit has been published and may be used. The actual existence of this vulnerability is currently in question. This issue is disputed due to the potential lack of crossing of security boundaries and the pre-requisites for a successful attack.
Which versions are affected by CVE-2026-14684?
How do I fix CVE-2026-14684?
No fix published yet.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-14684 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-14684 exists.
Sources
Also known as CLEANSTART-2026-ZL47685, DEBIAN-CVE-2026-14684, GHSA-5846-q349-47qp, UBUNTU-CVE-2026-14684.