# CVE-2026-25781: OpenHarmony out-of-bounds write leading to unrecoverable DoS

Source: https://junglewise.ai/threats/cve-2026-25781-openharmony-out-of-bounds-write-leading-to-unrecoverable-dos  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-19. Updated: 2026-05-19  
License: CC BY 4.0 with a link back

CVE-2026-25781 · Severity: high · CVSS 8.4 · Published 2026-05-19

A vulnerability in the OpenHarmony operating system allows a local user to trigger a permanent denial-of-service state. This flaw can render the affected device unusable, requiring manual intervention or hardware replacement as the system cannot recover on its own. This poses a significant risk to device availability and operational continuity for organizations using OpenHarmony-based hardware.

Technologies: [OpenHarmony](https://junglewise.ai/threats/technologies/openharmony). Vendors: [OpenHarmony](https://junglewise.ai/threats/vendors/openharmony).

## Quick answers

**Is CVE-2026-25781 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-25781 being exploited in the wild.

**How severe is CVE-2026-25781?** High severity, with a CVSS score of 8.4, published 19 May 2026.

**Which products and versions are affected?** OpenHarmony v6.0 and prior versions.

**Is there a fix for CVE-2026-25781?** 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-2026-25781 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-25781?** Check whether you run OpenHarmony 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

An out-of-bounds write vulnerability (CWE-787) exists in OpenHarmony v6.0 and earlier. A local attacker with low privileges can exploit this flaw to trigger a denial-of-service (DoS) condition. According to the advisory, the resulting system failure is non-recoverable, suggesting corruption of critical system components or firmware. While the provided CVSS vector (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N) strangely emphasizes Confidentiality and Integrity over Availability, the descriptive text explicitly confirms a permanent DoS impact.

## Affected products

- OpenHarmony OpenHarmony v6.0 and prior versions

## Timeline

- 2026-05-19: disclosed
- 2026-05-19: advisory

## References

- [https://gitcode.com/openharmony/security/tree/master/zh/security-disclosure/2026/2026-05.md](https://gitcode.com/openharmony/security/tree/master/zh/security-disclosure/2026/2026-05.md)

## Related threats

- [OpenHarmony signal handler race condition causing DOS](https://junglewise.ai/threats/cve-2026-33565-openharmony-signal-handler-race-condition-causing-dos)
- [OpenHarmony denial of service via improper input validation](https://junglewise.ai/threats/cve-2026-28751-openharmony-denial-of-service-via-improper-input-validation)
- [OpenHarmony use-after-free arbitrary code execution](https://junglewise.ai/threats/cve-2026-28733-openharmony-use-after-free-arbitrary-code-execution)
- [OpenHarmony integer overflow denial of service](https://junglewise.ai/threats/cve-2026-27781-openharmony-integer-overflow-denial-of-service)
- [OpenHarmony signal handler race condition information leak](https://junglewise.ai/threats/cve-2026-27766-openharmony-signal-handler-race-condition-information-leak)