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.