CVE-2026-39880: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in remnawave backend
Remnawave Backend is the backend for the Remnawave proxy and user management solution. Prior to 2.7.5, a glitch in the HWID device registration logic allows an authenticated user to bypass the configured limit for HWID devices and register more devices than expected, allowing them to resell subscriptions and consume excessive traffic. This vulnerability is fixed in 2.7.5.
AI Analysis
Technical Summary
The Remnawave backend contains a concurrency issue (CWE-362) in its HWID device registration logic before version 2.7.5. Due to improper synchronization, authenticated users can exploit a race condition to exceed the allowed number of HWID device registrations. This flaw enables abuse such as subscription reselling and increased traffic usage. The vulnerability does not impact confidentiality or availability but affects integrity by allowing unauthorized device registrations. The issue is resolved in Remnawave backend version 2.7.5.
Potential Impact
An authenticated user can register more HWID devices than the configured limit, potentially leading to unauthorized subscription reselling and excessive consumption of network traffic. There is no direct impact on confidentiality or availability reported. The integrity of the device registration process is compromised.
Mitigation Recommendations
Upgrade the Remnawave backend to version 2.7.5 or later where this race condition vulnerability is fixed. Since no official remediation level or patch link is provided, verify with the vendor for the official patch and update guidance. Until upgraded, monitor for unusual device registration activity to detect potential abuse.
CVE-2026-39880: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in remnawave backend
Description
Remnawave Backend is the backend for the Remnawave proxy and user management solution. Prior to 2.7.5, a glitch in the HWID device registration logic allows an authenticated user to bypass the configured limit for HWID devices and register more devices than expected, allowing them to resell subscriptions and consume excessive traffic. This vulnerability is fixed in 2.7.5.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Remnawave backend contains a concurrency issue (CWE-362) in its HWID device registration logic before version 2.7.5. Due to improper synchronization, authenticated users can exploit a race condition to exceed the allowed number of HWID device registrations. This flaw enables abuse such as subscription reselling and increased traffic usage. The vulnerability does not impact confidentiality or availability but affects integrity by allowing unauthorized device registrations. The issue is resolved in Remnawave backend version 2.7.5.
Potential Impact
An authenticated user can register more HWID devices than the configured limit, potentially leading to unauthorized subscription reselling and excessive consumption of network traffic. There is no direct impact on confidentiality or availability reported. The integrity of the device registration process is compromised.
Mitigation Recommendations
Upgrade the Remnawave backend to version 2.7.5 or later where this race condition vulnerability is fixed. Since no official remediation level or patch link is provided, verify with the vendor for the official patch and update guidance. Until upgraded, monitor for unusual device registration activity to detect potential abuse.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-07T20:32:03.010Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d6b51c1cc7ad14daaa5cf0
Added to database: 4/8/2026, 8:05:48 PM
Last enriched: 4/8/2026, 8:21:11 PM
Last updated: 4/9/2026, 6:24:04 AM
Views: 13
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