CVE-2026-14683 HdrHistogram AbstractHistogram.java memory allocation
Local attackers can cause denial of service via uncontrolled memory allocation in HdrHistogram's decode function, though the vulnerability is disputed.
- 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-2026-14683?
CVE-2026-14683 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 vulnerability was detected in HdrHistogram up to 2.2.2. Affected by this issue is the function org.HdrHistogram.AbstractHistogram.decodeFromCompressedByteBuffer of the file src/main/java/org/HdrHistogram/AbstractHistogram.java. The manipulation of the argument lengthOfCompressedContents results in uncontrolled memory allocation. The attack needs to be approached locally. The exploit is now public and may be used. It is still unclear if this vulnerability genuinely exists. 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-2026-14683?
How do I fix CVE-2026-14683?
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-2026-14683 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-14683 exists.
Sources
Also known as CLEANSTART-2026-YI89745, CLSA-2026-1791983637, CLSA-2026-1793128769, CLSA-2026-1793198846, CLSA-2026-1793198943, DEBIAN-CVE-2026-14683 and 2 more.