Vulnerability in Remnawave Backend (CVE-2026-39880)
Summary
Vulnerability in Remnawave Backend (CVE-2026-39880). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 2.7.5 or later.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-39880 has been found in Remnawave Backend.
Risk of unauthorized operations or information disclosure. CVSS score: 5.0/10.
What to do: upgrade Remnawave Backend to 2.7.5 or later.
If unsure, ask your IT team or search "Remnawave Backend CVE-2026-39880" on the vendor's site.
CVE-2026-39880 (Remnawave Backend) — CWE-362 / CVSS v3 5.0
Attack vector: remote (network-reachable) / no user interaction
Patched: 2.7.5 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-362) exists in Remnawave Backend.
Check the vendor advisory for the affected versions of Remnawave Backend.
Severity: Medium (CVSS 5.0/10). Risk of unauthorized operations or information disclosure.
Update to 2.7.5.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Remnawave Backend を使っているサービスとバージョンを洗い出す。
-
2Apply patch patch
Upgrade Remnawave Backend to 2.7.5ステージング環境で 2.7.5 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov