# 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.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **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:** Yes
- **Published:** 4 Jul 2026
- **Updated:** 16 Jul 2026
- **Also known as:** CLEANSTART-2026-YI89745, CLSA-2026-1791983637, CLSA-2026-1793128769, CLSA-2026-1793198846, CLSA-2026-1793198943, DEBIAN-CVE-2026-14683, GHSA-xw83-8gp3-pg5q, UBUNTU-CVE-2026-14683

## 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.

Weakness: CWE-789 (Memory Allocation with Excessive Size Value), CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-14683?


## How do I fix CVE-2026-14683?

No fix published yet.

## Is CVE-2026-14683 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-14683 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-14683 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-14683 exists.

Affected product: HdrHistogram. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-14683/ (Markdown: https://insights.sbomify.com/CVE-2026-14683/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-14683
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-14683
- OSV: https://osv.dev/vulnerability/CVE-2026-14683

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-14683/
Summaries are generated and may contain mistakes; the official description above is the record.