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CVE-2026-88016 high CVSS 7.1

Vulnerability in github.com/rclone/rclone (CVE-2026-88016)

Summary

Vulnerability in github.com/rclone/rclone (CVE-2026-88016). Data can be tampered with by attackers. Exploitable via os.Root. Mitigation: upgrade to 1.75.1 or later.

Original description

The description as published by the source.

Summary

With -l/--links, rclone's local backend recreates a source .rclonelink object as a real symlink at the destination verbatim (preserved by design for faithful backups). Directory-metadata application, however, does not go through the os.Root sandbox and does not use NOFOLLOW syscalls. A local Directory always has translatedLink=false, so when the destination path already exists as a planted symlink, rclone applies chmod/chown/chtimes through that symlink to a target outside the destination tree. An attacker who controls the source contents (malicious/compromised remote, shared bucket) obtains attacker-valued chmod/chown/chtimes of an arbitrary path outside the backup destination.

Root Cause

  • MkdirMetadata (backend/local/local.go:895) calls f.lstat (=os.Lstat, local.go:465) on the destination path. On a pre-planted symlink, os.Lstat succeeds, so the errors.Is(err, os.ErrNotExist) branch (local.go:896) that would create a real directory via the os.Root-guarded f.Mkdir is not taken. Instead a Directory is built directly on the symlink path.
  • writeMetadataToFile runs raw os.Chown (backend/local/metadata.go:131) and os.Chmod (metadata.go:158); setTimes runs raw os.Chtimes (backend/local/local.go:1318).
  • The CVE-2024-52522 NOFOLLOW fix (os.Lchown/lChmod/lChtimes) is gated on if o.translatedLink (metadata.go:128/150, local.go:1315). A Directory (newDirectory→newObject with…

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-2026-88016 has been found in github.com/rclone/rclone.
Attackers can target a specific entry point like os.Root over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 7.1/10.
What to do: upgrade github.com/rclone/rclone to 1.75.1 or later.
If unsure, ask your IT team or search "github.com/rclone/rclone CVE-2026-88016" on the vendor's site.

CVE-2026-88016 (github.com/rclone/rclone) — CWE-59 / CVSS v3 7.1
Attack vector: remote (network-reachable)
Attack surface: os.Root / Directory / chmod / chown
Patched: 1.75.1 — 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.

❓ What is the problem

A vulnerability (CWE-59) exists in github.com/rclone/rclone. Attackers reach the vulnerable code path via os.Root.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/rclone/rclone. Attack surface: os.Root / Directory / chmod / chown.

🔥 Severity

Severity: High (CVSS 7.1/10). Data can be tampered with by attackers.

🔧 How to fix

Update to 1.75.1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/rclone/rclone' . 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

  1. 1
    Identify exposure identify 
    grep -r 'github.com/rclone/rclone' . | 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 github.com/rclone/rclone を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade github.com/rclone/rclone to 1.75.1

    ステージング環境で 1.75.1 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。

  3. 3
    Post-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。

Affected packages

go github.com/rclone/rclone
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.75.1"}]}]

References

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