RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Security bypass, Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306 and CWE-78.
Summary
Rclone is a command-line program to sync files and directories to and from different cloud storage providers. Starting in version 1.48.0 and prior to version 1.73.5, the RC endpoint `operations/fsinfo` is exposed without `AuthRequired: true` and accepts attacker-controlled `fs` input. Because `rc.GetFs(...)` supports inline backend definitions, an unauthenticated attacker can instantiate an attacker-controlled backend on demand. For the WebDAV backend, `bearer_token_command` is executed during backend initialization, making single-request unauthenticated local command execution possible on reachable RC deployments without global HTTP authentication. Version 1.73.5 patches the issue.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
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 | 1.48.0 to before 1.73.5 | 1.73.5 | Patch available | CNA |
| — | github.com/rclone/rclone (Go) | 1.48.0 to before 1.73.5 | 1.73.5 | Patch available | GHSA-jfwf-28xr-xw6q |
- rclone Vendorrclone Affected 1.48.0 to before 1.73.5 Fixed in 1.73.5 Patch available CNA
- github.com/rclone/rclone (Go) Vendor— Affected 1.48.0 to before 1.73.5 Fixed in 1.73.5 Patch available GHSA-jfwf-28xr-xw6q
Remediation
- Fix · CNA rclone (rclone) Fixed in 1.73.5
- Fix · GHSA-jfwf-28xr-xw6q github.com/rclone/rclone (Go) Fixed in 1.73.5 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 2 products
- OpenShift API for Data Protection
- Red Hat Advanced Cluster Management for Kubernetes 2
Timeline
- 2026-10-02 Threatist record created from CVE-2026-41179
- 2026-10-03 Alias added: GHSA-jfwf-28xr-xw6q
- 2026-10-25 EPSS moved to the 95th–99th percentile
References
Other 7
- https://github.com/rclone/rclone/commit/2a9e952b38e03a96bf40c9eb6e8e22199865ee3b
- https://github.com/rclone/rclone/blob/bf55d5e6d37fd86164a87782191f9e1ffcaafa82/backend/webdav/webdav.go
- https://github.com/rclone/rclone/blob/bf55d5e6d37fd86164a87782191f9e1ffcaafa82/fs/operations/rc.go
- https://github.com/rclone/rclone/blob/bf55d5e6d37fd86164a87782191f9e1ffcaafa82/fs/rc/cache.go
- https://github.com/rclone/rclone/releases/tag/v1.73.5
- https://rclone.org/changelog/#v1-73-5-2026-04-19
- https://github.com/rclone/rclone
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-2026-29799 Rclone: Unauthenticated options/set allows runtime auth bypass, leading to sensitive operations and command execution CVSS 4.0CRITICAL 9.2
- TI-2026-42602 Path traversal in rclone CVSS 3.1HIGH 8.8
- TI-2026-39407 rclone: Unvalidated symlink target in local `--links` — arbitrary file write from an untrusted remote CVSS 3.1HIGH 8.8
- TI-2026-80211 Authentication bypass in rclone serve webdav via OPTIONS requests CVSS 4.0MEDIUM 6.9
- TI-2026-80206 Integer overflow in rclone serve s3 lets attackers exhaust memory CVSS 4.0MEDIUM 6.9
Sources
- CVE-2026-41179 · CVE Program
- CVE-2026-41179 · NVD
- FIRST EPSS
- GHSA-jfwf-28xr-xw6q · GitHub Advisory Database · CC BY 4.0
- CVE-2026-41179 · Red Hat security data · CC BY 4.0
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