CVE-2026-34856
Published: 13 April 2026
Summary
CVE-2026-34856 is a high-severity Race Condition (CWE-362) vulnerability in Huawei Harmonyos. Its CVSS base score is 7.3 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 0.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-34856 is a Use-After-Free (UAF) vulnerability, associated with CWE-362 (race condition), in the communication module of Huawei products. Published on 2026-04-13, it carries a CVSS v3.1 base score of 7.3 (AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H), indicating high severity primarily due to its potential to disrupt availability.
The vulnerability can be exploited by a local attacker requiring low complexity, no privileges, and no user interaction. Successful exploitation may affect availability with high impact, alongside low impacts to confidentiality and integrity, allowing disruption of services or denial-of-service conditions on affected devices.
Huawei has issued security bulletins addressing this issue, available at https://consumer.huawei.com/en/support/bulletin/2026/4/ and https://consumer.huawei.com/en/support/bulletinwearables/2026/4/, which detail patches and mitigation guidance for consumer products including wearables.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-21800
Vulnerability details
UAF vulnerability in the communication module. Impact: Successful exploitation of this vulnerability may affect availability.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The Use-After-Free vulnerability enables local exploitation leading to high-impact denial-of-service conditions on availability, directly mapping to application or system exploitation for endpoint DoS.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly addresses the UAF vulnerability by requiring timely patching and correction of the specific flaw as detailed in Huawei security bulletins.
Implements memory protection mechanisms that prevent exploitation of use-after-free vulnerabilities through proper memory isolation and safeguards.
Ensures receipt and implementation of vendor security advisories and bulletins for vulnerabilities like CVE-2026-34856 to enable rapid flaw remediation.