Information Disclosure in RustFS (CVE-2026-55188)
Summary
Vulnerability in RustFS (CVE-2026-55188). Confidential information can be exposed externally. Mitigation: upgrade to 1.0.0-beta.9 or later.
Original description
The description as published by the source.
RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, RustFS contains an authorization bypass in the bucket replication admin API. The ListRemoteTargetHandler handler for listing remote replication targets only checks whether request credentials exist, but does not verify that the caller has replication or administrator permissions. As a result, an authenticated user with no effective bucket or admin permissions can list remote replication target configuration for a bucket. Because the returned BucketTarget objects include remote target credentials, this can disclose replication access keys and secret keys. This vulnerability is fixed in 1.0.0-beta.9.
Source: NIST National Vulnerability Database NVD
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-2026-55188 has been found in RustFS.
Confidential information can be exposed externally. CVSS score: 8.2/10.
What to do: upgrade RustFS to 1.0.0-beta.9 or later.
If unsure, ask your IT team or search "RustFS CVE-2026-55188" on the vendor's site.
CVE-2026-55188 (RustFS) — CWE-200 / CVSS v3 8.2
Attack vector: remote (network-reachable) / no user interaction
Patched: 1.0.0-beta.9 — 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.
Information disclosure (CWE-200) exists in RustFS.
Check the vendor advisory for the affected versions of RustFS.
Severity: High (CVSS 8.2/10). Confidential information can be exposed externally.
Update to 1.0.0-beta.9.
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. Run grep -r 'RustFS' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'RustFS' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
RustFSを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade RustFS to 1.0.0-beta.9ステージング環境で 1.0.0-beta.9 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。
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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
- web github.com