EUVD-2026-30534
GHSA-37mq-vvr9-ppr8
Severity by source
AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds write vulnerability in the distributed file system module. Impact: Successful exploitation of this vulnerability may affect availability.
AnalysisAI
Out-of-bounds write in Huawei HarmonyOS and EMUI distributed file system module allows authenticated local attackers to corrupt memory, potentially affecting system availability and integrity. CVSS 6.8 reflects adjacent network access requirement and low attack complexity, but exploitation requires prior authentication and local network presence. No public exploit code or active exploitation confirmed at time of analysis.
Technical ContextAI
The vulnerability exists in the distributed file system (DFS) module, a core component responsible for managing file operations across networked nodes in HarmonyOS and EMUI ecosystems. The underlying flaw is CWE-787 (out-of-bounds write), a memory corruption vulnerability where the DFS module fails to properly validate buffer boundaries during write operations. This allows an authenticated user on an adjacent network to write data beyond allocated memory regions, corrupting heap or stack structures. The attack vector is adjacent network (AV:A), indicating the attacker must be on the same network segment as the target device, not remotely accessible via the internet.
RemediationAI
Consult Huawei security bulletins at https://consumer.huawei.com/en/support/bulletin/2026/5/ for HarmonyOS and https://consumer.huawei.com/en/support/bulletinwearables/2026/5/ for wearables/EMUI for patched versions and upgrade instructions. If patch is available, update to the recommended version immediately. As an interim compensating control, restrict network access to the affected device by disabling DFS module if not required for operations, or isolate the device to a trusted network segment where only authenticated devices have access. If DFS must remain enabled, implement network segmentation and strong authentication (disable default credentials, enforce strong passwords) to limit the pool of authenticated users who could exploit this vulnerability. Note: disabling DFS may impact file sharing and synchronization features across HarmonyOS devices.
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
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External POC / Exploit Code
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