rclone: source object names can escape the configured root on upload
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone core does not reject parent-directory segments in source Object.Remote() values before fs/list, fs/walk, fs/sync, and fs/operations pass those values to destination backends. A flat-keyspace source object store populated with native non-rclone tooling can contain a raw .. key segment, and affected b2, swift, qingstor, oracleobjectstorage, internetarchive, smb, storj, sftp, webdav, ftp, filelu, shade, and sia destinations use path.Join(root, remote) before EncodeDot can neutralize the segment. A copy or upload can therefore escape the configured root into another bucket, share, or path reachable by the victim credential, with sftp and smb potentially reaching other filesystem or share locations under the same login authority. This issue is fixed in version 1.75.1.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| rclone | rclone | before 1.75.1 | 1.75.1 | Patch available | CNA |
| — | github.com/rclone/rclone (Go) | before 1.75.1 | 1.75.1 | Patch available | GHSA-38xv-hf3p-h7mq |
- rclone Vendorrclone Affected before 1.75.1 Fixed in 1.75.1 Patch available CNA
- github.com/rclone/rclone (Go) Vendor— Affected before 1.75.1 Fixed in 1.75.1 Patch available GHSA-38xv-hf3p-h7mq
Remediation
- Fix · CNA rclone (rclone) Fixed in 1.75.1
- Fix · GHSA-38xv-hf3p-h7mq github.com/rclone/rclone (Go) Fixed in 1.75.1 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Cryostat 4 | Affected | No fix yet: Fix deferred |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-88046
- 2026-10-03 Alias added: GHSA-38xv-hf3p-h7mq
References
More rclone vulnerabilities
- TI-2026-60044 rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass CVSS 3.1CRITICAL 9.8
- TI-2026-29802 RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution CVSS 4.0CRITICAL 9.2
- TI-2026-29799 Rclone: Unauthenticated options/set allows runtime auth bypass, leading to sensitive operations and command execution CVSS 4.0CRITICAL 9.2
- TI-2026-60064 rclone: RC per-server auth-proxy bypass CVSS 3.1CRITICAL 9.1
- TI-2026-42602 Path traversal in rclone CVSS 3.1HIGH 8.8
- TI-2026-60065 rclone: S3 multipart declared-length memory exhaustion CVSS 3.1HIGH 7.5
Sources
- CVE-2026-88046 · CVE Program
- CVE-2026-88046 · NVD
- FIRST EPSS
- GHSA-38xv-hf3p-h7mq · GitHub Advisory Database · CC BY 4.0
- CVE-2026-88046 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences