How severe is CVE-2026-34865?

CVE-2026-34865 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2026-34865 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34865?

CVE-2026-34865 affects Huawei Harmonyos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34865?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34865 have an EU (EUVD) identifier?

Yes. CVE-2026-34865 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21877.

When was CVE-2026-34865 published?

CVE-2026-34865 was published on 2026-04-13 and last updated on 2026-06-17.

CVE-2026-34865

CVE-2026-34865 is a critical-severity vulnerability in Huawei Harmonyos with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 10.0
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21877
Weakness: CWE-122
Affected product: Huawei Harmonyos
Published: 2026-04-13
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-34865?: Out-of-bounds write vulnerability in the WEB module.Impact: Successful exploitation of this vulnerability will affect availability and confidentiality.
How severe is CVE-2026-34865?: CVE-2026-34865 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2026-34865 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34865?: CVE-2026-34865 affects Huawei Harmonyos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34865?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34865 have an EU (EUVD) identifier?: Yes. CVE-2026-34865 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21877.
When was CVE-2026-34865 published?: CVE-2026-34865 was published on 2026-04-13 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:o:huawei:harmonyos:6.0.0:*:*:*:*:*:*:*

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