CVE-2026-34866: CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Huawei HarmonyOS
Out-of-bounds write vulnerability in the WEB module.Impact: Successful exploitation of this vulnerability will affect availability and confidentiality.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-34866) in Huawei HarmonyOS 6.0.0 is a classic buffer overflow (CWE-120) caused by a buffer copy operation that does not properly check the size of input data in the WEB module. The out-of-bounds write can lead to corruption of memory, potentially affecting system availability and confidentiality. The CVSS 3.1 base score is 5.1 (medium), reflecting local attack vector with low complexity and no privileges or user interaction required. No patch or official remediation guidance has been published by Huawei as of the vulnerability disclosure date.
Potential Impact
Exploitation of this vulnerability can lead to denial of service (availability impact) and unauthorized modification or leakage of data (confidentiality impact). The attack requires local access to the device. There are no reports of active exploitation in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should limit local access to affected devices and monitor for updates from Huawei regarding patches or mitigations.
CVE-2026-34866: CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Huawei HarmonyOS
Description
Out-of-bounds write vulnerability in the WEB module.Impact: Successful exploitation of this vulnerability will affect availability and confidentiality.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-34866) in Huawei HarmonyOS 6.0.0 is a classic buffer overflow (CWE-120) caused by a buffer copy operation that does not properly check the size of input data in the WEB module. The out-of-bounds write can lead to corruption of memory, potentially affecting system availability and confidentiality. The CVSS 3.1 base score is 5.1 (medium), reflecting local attack vector with low complexity and no privileges or user interaction required. No patch or official remediation guidance has been published by Huawei as of the vulnerability disclosure date.
Potential Impact
Exploitation of this vulnerability can lead to denial of service (availability impact) and unauthorized modification or leakage of data (confidentiality impact). The attack requires local access to the device. There are no reports of active exploitation in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should limit local access to affected devices and monitor for updates from Huawei regarding patches or mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- huawei
- Date Reserved
- 2026-03-31T01:11:13.701Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69dcd01e82d89c981fbb28c5
Added to database: 4/13/2026, 11:14:38 AM
Last enriched: 4/13/2026, 11:17:41 AM
Last updated: 4/14/2026, 8:15:37 AM
Views: 8
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