What is CVE-2026-34863?

CVE-2026-34863 is a medium-severity vulnerability in Huawei Harmonyos, classified under Out-of-bounds Write. CVSS score: 6.7/10. Published 2026-04-13.

How severe is CVE-2026-34863?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Buffer overflow in Huawei Harmonyos

CVE-2026-34863

Out-of-bounds write vulnerability in the file system. Impact: Successful exploitation of this vulnerability may affect availability.

Vulnerability class: Buffer Overflow

Published 2026-04-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.2th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Huawei Harmonyos — versions 6.0.0, 5.1.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

consumer.huawei.com/en/support/bulletin/2026/4/ (Vendor Advisory)

Frequently asked questions

What is CVE-2026-34863?: CVE-2026-34863 is a medium-severity vulnerability in Huawei Harmonyos, classified under Out-of-bounds Write. CVSS score: 6.7/10. Published 2026-04-13.
How severe is CVE-2026-34863?: Medium severity. CVSS v3 base score is 6.7 out of 10.