EUVD-2026-21846
GHSA-qrvp-579j-2cf5
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessGain local system access
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DeliveryCraft overflowed input data
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ExploitTrigger application read module
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ExecutionCorrupt memory via buffer overflow
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ImpactExecute arbitrary code or crash system
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, buffer size validation
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 6.8 (Medium) with AV:L (local only) and AC:L (low complexity) indicates a realistic but not network-exploitable threat. The vulnerability carries high availability impact (A:H) and integrity compromise (I:L), but confidentiality is unaffected (C:N). The local-only attack vector significantly reduces real-world risk compared to remote exploits, as it requires prior system access (e.g., via another vulnerability, malicious app, or physical access). The CVSS scoring aligns with a local privilege escalation or denial-of-service scenario typical of buffer overflows. However, without EPSS data or KEV confirmation, this appears to be a moderate-priority issue best remediated through standard patching cycles rather than emergency response. Organizations should prioritize network-exploitable vulnerabilities and confirmed active exploitation over this local vector. |
| Exploit ScenarioDerived | A local attacker or malicious application on a HarmonyOS device crafts an input to the application read module that exceeds the buffer boundary, triggering a stack or heap overflow. By carefully constructing the overflow payload, the attacker overwrites adjacent memory structures (such as function return addresses or function pointers) to gain code execution with elevated privileges, or deliberately corrupts critical memory regions to crash the system and deny service to legitimate users. |
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Alert meAnalysisAIv1 – Apr 13, 2026
Local privilege escalation in HarmonyOS application read module allows unauthenticated local attackers to cause memory corruption through a boundary-unlimited buffer overflow, potentially achieving code execution or system crash with high availability impact. CVSS 6.8 reflects local attack vector with integrity and availability consequences. Huawei has released security bulletins addressing this CWE-119 vulnerability affecting HarmonyOS devices.
RemediationAI
Apply the security updates provided in Huawei's official security bulletins. Visit https://consumer.huawei.com/en/support/bulletin/2026/4/ for consumer HarmonyOS devices and https://consumer.huawei.com/en/support/bulletinwearables/2026/4/ for wearable devices to identify the exact patched firmware version for your device model. Huawei will provide specific firmware version numbers and over-the-air update instructions through these channels. Until patches are applied, restrict physical access to devices and avoid installing untrusted applications from non-official sources, as this vulnerability requires local access to exploit.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is a classic boundary-unlimited buffer overflow (CWE-119) in HarmonyOS's application read module, a component responsible for reading and processing application data or resources. The root cause is insufficient bounds checking when writing to a fixed-size memory buffer, allowing an attacker to overflow the buffer and corrupt adjacent memory. The CVSS vector (AV:L/AC:L/PR:N/UI:N/S:U) indicates this is a local privilege escalation requiring only file system or local process access, with no prerequisites or user interaction needed. The affected products are all versions of HarmonyOS (CPE: cpe:2.3:a:huawei:harmonyos:*:*:*:*:*:*:*:*), suggesting this is a foundational issue in the OS kernel or core libraries rather than a specific version.
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Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionNVD
Boundary-unlimited vulnerability in the application read module. Impact: Successful exploitation of this vulnerability may affect availability.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
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