What is CVE-2026-34866?

CVE-2026-34866 is a medium-severity vulnerability in Huawei Harmonyos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.1/10. Published 2026-04-13.

How severe is CVE-2026-34866?

Medium severity. CVSS v3 base score is 5.1 out of 10.

Buffer overflow in Huawei Harmonyos

CVE-2026-34866

Out-of-bounds write vulnerability in the WEB module.Impact: Successful exploitation of this vulnerability will affect availability and confidentiality.

Vulnerability class: Buffer Overflow

EPSS: 0.000 (1.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

Huawei Harmonyos — versions 6.0.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

consumer.huawei.com/en/support/bulletinwearables/2026/4/

Frequently asked questions

What is CVE-2026-34866?: CVE-2026-34866 is a medium-severity vulnerability in Huawei Harmonyos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.1/10. Published 2026-04-13.
How severe is CVE-2026-34866?: Medium severity. CVSS v3 base score is 5.1 out of 10.