# CVE-2026-27766: OpenHarmony signal handler race condition information leak

Source: https://junglewise.ai/threats/cve-2026-27766-openharmony-signal-handler-race-condition-information-leak  
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-2026-27766 · Severity: medium · CVSS 5.5 · Published 2026-05-19

A vulnerability in the OpenHarmony operating system allows a local user to gain unauthorized access to sensitive information. OpenHarmony is an open-source operating system designed for smart devices and IoT hardware. An attacker with existing low-level access to a device could exploit this flaw to bypass privacy protections and leak data, potentially compromising user confidentiality.

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

## Quick answers

**Is CVE-2026-27766 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-27766 being exploited in the wild.

**How severe is CVE-2026-27766?** Medium severity, with a CVSS score of 5.5, published 19 May 2026.

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

**Is there a fix for CVE-2026-27766?** 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-2026-27766 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-27766?** 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

A signal handler race condition (CWE-364) exists in OpenHarmony v6.0 and earlier. The vulnerability allows a local attacker with low privileges to exploit timing discrepancies during signal handling to access memory or data that should otherwise be protected. This results in a high impact on confidentiality but does not directly affect system integrity or availability. The attack requires local access to the device and does not require user interaction.

## Affected products

- OpenHarmony OpenHarmony v6.0 and prior versions

## Timeline

- 2026-05-19: disclosed: Initial publication of the CVE record.

## 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 remote code execution in pre-installed apps](https://junglewise.ai/threats/cve-2026-27648-openharmony-remote-code-execution-in-pre-installed-apps)