# CVE-2026-14684: HdrHistogram uncontrolled memory allocation in AbstractHistogram

Source: https://junglewise.ai/threats/cve-2026-14684-hdrhistogram-uncontrolled-memory-allocation-in-abstracthistogram  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-05. Updated: 2026-07-05  
License: CC BY 4.0 with a link back

CVE-2026-14684 · Severity: low · CVSS 3.3 · Published 2026-07-05

HdrHistogram is a Java library used for recording and analyzing high dynamic range data, often used in performance monitoring. A flaw in how the library processes data from memory buffers could allow a local user to cause the application to crash by triggering excessive memory consumption. This could lead to a denial-of-service condition, impacting the availability of monitoring tools or applications using this library.

Technologies: [HdrHistogram](https://junglewise.ai/threats/technologies/hdrhistogram). Vendors: [HdrHistogram](https://junglewise.ai/threats/vendors/hdrhistogram).

## Quick answers

**Is CVE-2026-14684 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-14684 being exploited in the wild.

**How severe is CVE-2026-14684?** Low severity, with a CVSS score of 3.3, published 5 July 2026.

**Which products and versions are affected?** HdrHistogram Up to 2.2.2.

**Is there a fix for CVE-2026-14684?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-14684 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-14684?** Check whether you run HdrHistogram at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability classified as CWE-789 (Memory Allocation with Excessive Size Value) and CWE-400 (Uncontrolled Resource Consumption) exists in HdrHistogram up to version 2.2.2. The flaw is located in the `org.HdrHistogram.AbstractHistogram.decodeFromByteBuffer` function within `src/main/java/org/HdrHistogram/AbstractHistogram.java`. By manipulating the `numberOfSignificantValueDigits` argument in a serialized buffer, a local attacker can trigger an Out-of-Memory (OOM) condition. While an exploit has been published, the project has not yet released a formal patch at the time of reporting. The attack requires local access and low privileges.

## Affected products

- HdrHistogram HdrHistogram Up to 2.2.2

## Timeline

- 2026-07-05: advisory: NVD publication date
- 2026-07-05: disclosed: Public disclosure of the vulnerability and exploit

## References

- [https://github.com/HdrHistogram/HdrHistogram/](https://github.com/HdrHistogram/HdrHistogram/)
- [https://github.com/HdrHistogram/HdrHistogram/issues/220](https://github.com/HdrHistogram/HdrHistogram/issues/220)
- [https://vuldb.com/cve/CVE-2026-14684](https://vuldb.com/cve/CVE-2026-14684)
- [https://vuldb.com/submit/846754](https://vuldb.com/submit/846754)
- [https://vuldb.com/vuln/376280](https://vuldb.com/vuln/376280)
- [https://vuldb.com/vuln/376280/cti](https://vuldb.com/vuln/376280/cti)

## Related threats

- [HdrHistogram incorrect comparison in DoubleHistogram recordValue](https://junglewise.ai/threats/cve-2026-14686-hdrhistogram-incorrect-comparison-in-doublehistogram-recordvalue)
- [HdrHistogram state manipulation in recordValueWithCount](https://junglewise.ai/threats/cve-2026-14685-hdrhistogram-state-manipulation-in-recordvaluewithcount)
- [HdrHistogram uncontrolled memory allocation in AbstractHistogram](https://junglewise.ai/threats/cve-2026-14683-hdrhistogram-uncontrolled-memory-allocation-in-abstracthistogram)