CVE-2026-34866

Received Received - Intake

Out-of-Bounds Write in WEB Module Affecting Availability, Confidentiality

Publication date: 2026-04-13

Last updated on: 2026-04-17

Assigner: Huawei Technologies

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-13

Last Modified

2026-04-17

Generated

2026-07-06

AI Q&A

2026-04-13

EPSS Evaluated

2026-07-05

NVD

CVE-2026-34866

EUVD

EUVD-2026-21879

Affected Vendors & Products

Vendor	Product	Version / Range
huawei	harmonyos	6.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-120	The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds write issue found in the WEB module. An out-of-bounds write occurs when a program writes data outside the boundaries of allocated memory, which can lead to unexpected behavior or system instability.

Impact Analysis

Successful exploitation of this vulnerability can impact the availability and confidentiality of the affected system.

Compliance Impact

This vulnerability affects confidentiality and availability, which are key aspects addressed by standards like GDPR and HIPAA. A successful exploitation could lead to unauthorized data modification or service disruption, potentially resulting in non-compliance with these regulations' requirements for data protection and system availability.

Mitigation Strategies

To mitigate this vulnerability, it is recommended to apply the latest security updates provided by the vendor. Huawei released an April 2026 security update that addresses multiple vulnerabilities in HarmonyOS-based devices, including those affecting various modules.

Ensuring your Huawei HarmonyOS devices are updated to the latest firmware version will help protect against this out-of-bounds write vulnerability in the WEB module.

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