# CVE-2026-27781: OpenHarmony integer overflow denial of service

Source: https://junglewise.ai/threats/cve-2026-27781-openharmony-integer-overflow-denial-of-service  
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-2026-27781 · Severity: low · CVSS 3.3 · Published 2026-05-19

A vulnerability in the OpenHarmony operating system allows a local user to cause a denial-of-service (DoS) condition. OpenHarmony is an open-source distributed operating system designed for smart devices. An exploit could allow a malicious user already on the device to crash system components, potentially disrupting device availability and user operations.

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

## Quick answers

**Is CVE-2026-27781 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-27781 being exploited in the wild.

**How severe is CVE-2026-27781?** Low severity, with a CVSS score of 3.3, published 19 May 2026.

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

**Is there a fix for CVE-2026-27781?** 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-2026-27781 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-27781?** 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 integer overflow or wraparound (CWE-190) exists in OpenHarmony v6.0 and earlier versions. A local attacker with low privileges can exploit this flaw to trigger a denial-of-service (DoS) condition. The vulnerability is reachable locally without user interaction. While the specific component within the OS is not named in the advisory, the root cause is identified as an integer overflow, which typically leads to memory corruption or logic errors that crash the affected process. Patch information is available via the OpenHarmony security disclosure for April 2026.

## Affected products

- OpenHarmony OpenHarmony v6.0 and prior versions

## Timeline

- 2026-05-19: advisory: NVD publication date

## References

- [https://gitcode.com/openharmony/security/tree/master/zh/security-disclosure/2026/2026-04.md](https://gitcode.com/openharmony/security/tree/master/zh/security-disclosure/2026/2026-04.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 signal handler race condition information leak](https://junglewise.ai/threats/cve-2026-27766-openharmony-signal-handler-race-condition-information-leak)
- [OpenHarmony remote code execution in pre-installed apps](https://junglewise.ai/threats/cve-2026-27648-openharmony-remote-code-execution-in-pre-installed-apps)