CVE-2025-26474: Openatom OpenHarmony Info Disclosure Flaw

CVE-2025-26474 Overview

CVE-2025-26474 is an improper input validation vulnerability affecting OpenHarmony v5.0.3 and prior versions. This security flaw allows a local attacker to cause information disclosure through improper input handling. The vulnerability can only be exploited in restricted scenarios, limiting its overall impact but still presenting a security concern for affected deployments.

Critical Impact

Local attackers with low privileges can exploit improper input validation to disclose sensitive information in restricted scenarios.

Affected Products

• OpenAtom OpenHarmony v5.0.3
• OpenAtom OpenHarmony versions prior to v5.0.3

Discovery Timeline

• 2026-03-16 - CVE-2025-26474 published to NVD
• 2026-03-17 - Last updated in NVD database

Technical Details for CVE-2025-26474

Vulnerability Analysis

This vulnerability stems from improper input validation (CWE-20) within OpenHarmony's codebase. The flaw allows local attackers to manipulate input in a way that leads to unintended information disclosure. The attack requires local access to the system and low-level privileges, meaning the attacker must already have some form of authenticated access to the device running OpenHarmony.

The confidentiality impact is limited, with no direct effect on system integrity or availability. The vulnerability specifically affects the input handling mechanisms, where insufficient validation allows crafted inputs to bypass security controls and access information that should otherwise be restricted.

Root Cause

The root cause of CVE-2025-26474 is improper input validation (CWE-20). The affected component fails to properly validate, filter, or sanitize user-supplied input before processing. This allows malicious actors to submit specially crafted input that the system processes in unintended ways, resulting in information leakage.

Input validation vulnerabilities occur when software does not validate or incorrectly validates input that can affect the control flow or data flow of a program. In this case, the insufficient validation enables local attackers to extract sensitive information through manipulated inputs.

Attack Vector

The attack vector for CVE-2025-26474 is local, requiring the attacker to have physical or authenticated access to the target system. The exploitation scenario involves:

1. An attacker with local access and low privileges on an OpenHarmony device
2. Crafting malicious input to target the vulnerable component
3. Exploiting the improper input validation to disclose restricted information
4. The attack succeeds only under specific restricted conditions

The vulnerability does not require user interaction and has low attack complexity once the attacker has local access. However, the exploitation is constrained to restricted scenarios, which limits the practical exploitability of this flaw.

Detection Methods for CVE-2025-26474

Indicators of Compromise

• Unusual input patterns or malformed requests to OpenHarmony system components
• Unexpected information access attempts from low-privileged local accounts
• Anomalous system behavior in input processing routines
• Log entries indicating input validation failures or bypass attempts

Detection Strategies

• Monitor local system logs for unusual input validation errors or exceptions
• Implement file integrity monitoring on OpenHarmony system components
• Review authentication logs for suspicious local account activity
• Deploy endpoint detection solutions to identify exploitation attempts

Monitoring Recommendations

• Enable verbose logging for input processing components in OpenHarmony
• Monitor for unusual memory access patterns that may indicate information disclosure
• Track privileged operations initiated by low-privilege accounts
• Implement behavioral analysis for local system interactions

How to Mitigate CVE-2025-26474

Immediate Actions Required

• Inventory all systems running OpenHarmony v5.0.3 and earlier versions
• Restrict local access to OpenHarmony devices to only essential personnel
• Apply the principle of least privilege for all local accounts
• Monitor affected systems for potential exploitation attempts until patched

Patch Information

OpenAtom has disclosed this vulnerability through their security advisory. Organizations should review the OpenHarmony Security Disclosure for detailed patch information and remediation guidance. Upgrade to a patched version of OpenHarmony as soon as available to fully remediate this vulnerability.

Workarounds

• Limit local access to OpenHarmony devices by implementing strict access controls
• Enforce strong authentication requirements for local accounts
• Implement additional input validation at the application layer where possible
• Isolate affected systems from sensitive data until patches can be applied

# Configuration example - Restrict local user access
# Review and restrict local account permissions on OpenHarmony devices
# Consult OpenHarmony documentation for specific access control commands

# General guidance:
# 1. Audit existing local accounts
# 2. Remove unnecessary local access privileges
# 3. Implement monitoring for local authentication events