CVE-2026-34865: Out-of-bounds write vulnerability in the WEB module.Impact: Successful exploitation of this vulnerability will

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CRITICAL 9.1REMOTEMITIGATE

CVE-2026-34865 is a critical-severity flaw (CVSS 9.1) affecting harmonyos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-04-13
Last modified	2026-10-26

Publisher (CNA): Huawei Technologies · Vendor: huawei

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-13 07:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

huawei harmonyos MITIGATE

Affected: 6.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34865?

harmonyos: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-34865 being exploited?

CVE-2026-34865 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34865 affect?

CVE-2026-34865 affects harmonyos. Severity is critical (CVSS 9.1). Out-of-bounds write vulnerability in the WEB module.Impact: Successful exploitation of this vulnerability will affect availability and confidentiality.

How urgent is CVE-2026-34865?

Priority 40/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Huawei vulnerabilities

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References

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