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CVE-2026-88046 medium CVSS 5.3

Path Traversal in github.com/rclone/rclone (CVE-2026-88046)

Summary

Path traversal in github.com/rclone/rclone (CVE-2026-88046). Data can be tampered with by attackers. Exploitable via Put. Mitigation: upgrade to 1.75.1 or later.

Original description

The description as published by the source.

Summary

Multiple backends, when given a specially crafted object to copy, can escape the backend confinement.

Backend Keep/Close Per-backend severity
sftp Medium Real filesystem escape, fires under default encoding.
smb Low-Medium Escapes to a different SMB share the credential can reach.
ftp Low Real, leading-.. overshoot PoC is partly neutralized by encoding; escape bounded to at/below the login base.
webdav Low Server-side ACLs are the real boundary.
b2 Low Same-account sibling bucket crossing on a flat keyspace.
swift Low Same, container.
qingstor Low Same.
oracleobjectstorage Low Same.
internetarchive Low IA items are owner-writable only; confined to user's own items.
storj Low Can retarget a different bucket in the same access grant.
filelu Low Confined to the user's own account.
shade Low Confined to the user's own drive.
sia Low siad API password already grants full-daemon access.

Root cause

rclone core does not sanitize .. in a source object's Remote() - verified: nothing in fs/march, fs/sync, fs/list, or fs/operations rejects .. segments before the name reaches the destination backend's Put/Update/Mkdir. Confinement is therefore each backend's responsibility, and these backends join root + remote without a check.

This divides into two classes:

  • Bucket based backends - `bucket.Split(path.Join(f…

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-2026-88046 has been found in github.com/rclone/rclone.
Attackers can target a specific entry point like Put over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 5.3/10.
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-2026-88046" on the vendor's site.

CVE-2026-88046 (github.com/rclone/rclone) — CWE-22 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: Put / Update / Mkdir / path.Join
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

Path traversal (CWE-22) exists in github.com/rclone/rclone. Attackers reach the vulnerable code path via Put without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/rclone/rclone. Attack surface: Put / Update / Mkdir / path.Join.

🔥 Severity

Severity: Medium (CVSS 5.3/10). 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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