# CVE-2026-34865: Huawei HarmonyOS out-of-bounds write in WEB module

Source: https://junglewise.ai/threats/cve-2026-34865-huawei-harmonyos-out-of-bounds-write-in-web-module  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-13. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2026-34865 · Severity: critical · CVSS 9.1 · Published 2026-04-13

A security vulnerability has been identified in the web browsing component of Huawei smartwatches running HarmonyOS. This flaw could allow an attacker to disrupt the device's operation or potentially access private information. Successful exploitation could lead to device instability or unauthorized data exposure, impacting the privacy and reliability of the wearable device.

Technologies: [Huawei Harmonyos](https://junglewise.ai/threats/technologies/harmonyos). Vendors: [Huawei](https://junglewise.ai/threats/vendors/huawei).

## Quick answers

**Is CVE-2026-34865 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34865 being exploited in the wild.

**How severe is CVE-2026-34865?** Critical severity, with a CVSS score of 9.1, published 13 April 2026.

**Which products and versions are affected?** Huawei HarmonyOS 6.0.0.

**Is there a fix for CVE-2026-34865?** A patch was published on 2026-04-08: Huawei released the security bulletin for smartwatches. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-34865 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-34865?** Check whether you run Huawei Harmonyos. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds write vulnerability (specifically a heap-based buffer overflow, CWE-122) exists in the WEB module of Huawei HarmonyOS 6.0.0. The flaw allows an attacker to write data past the end of an intended buffer, which can lead to memory corruption. According to the CVSS metrics, this is a network-reachable vulnerability that requires no prior authentication or user interaction. Exploitation can result in a denial-of-service condition or unauthorized access to sensitive information. Huawei has addressed this issue in the April 2026 security update for smartwatches.

## Affected products

- Huawei HarmonyOS 6.0.0

## Timeline

- 2026-04-08: patched: Huawei released the security bulletin for smartwatches.
- 2026-04-13: disclosed: Initial publication of the CVE.

## References

- [https://consumer.huawei.com/en/support/bulletinwearables/2026/4/](https://consumer.huawei.com/en/support/bulletinwearables/2026/4/)

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