CVE-2026-34866 Memory corruption in HarmonyOS
An out-of-bounds write in the WEB module allows attackers to compromise availability and confidentiality in HarmonyOS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34866?
CVE-2026-34866 is a medium-severity memory corruption vulnerability in Huawei Harmonyos, published on 13 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Out-of-bounds write vulnerability in the WEB module.Impact: Successful exploitation of this vulnerability will affect availability and confidentiality.
Weakness: CWE-120
Which versions are affected by CVE-2026-34866?
It affects 1 product.
Products include Huawei Harmonyos.
How do I fix CVE-2026-34866?
No fix has been published for CVE-2026-34866 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-34866 being exploited?
There is no known exploitation of CVE-2026-34866 in the wild and no public exploit code.
Other vulnerabilities in Huawei Harmonyos
Sources
Also known as GHSA-xvjp-783h-vvhp.