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

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Summary

CVECVE-2026-41179
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-23 00:16:45 UTC
Updated2026-07-15 02:21:14 UTC
DescriptionRclone 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.

Risk And Classification

Primary CVSS: v4.0 9.2 CRITICAL from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.091990000 probability, percentile 0.947550000 (date 2026-07-15)

Problem Types: CWE-78 | CWE-306 | CWE-94 | CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') | CWE-306 CWE-306: Missing Authentication for Critical Function | CWE-94 Improper Control of Generation of Code ('Code Injection')

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary9.2CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED9.2CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1ADPCVSS9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Rclone Rclone All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rclone Rclone affected >= 1.48.0, < 1.73.5 Not specified
ADP Red Hat OpenShift API For Data Protection Not specified Not specified
ADP Red Hat OpenShift API For Data Protection Not specified Not specified
ADP Red Hat OpenShift API For Data Protection Not specified Not specified
ADP Red Hat Red Hat Advanced Cluster Management For Kubernetes 2 Not specified Not specified

References

ReferenceSourceLinkTags
github.com/rclone/rclone/blob/bf55d5e6d37fd86164a87782191f9e1ffcaafa82/b... [email protected] github.com Product
rclone.org/changelog [email protected] rclone.org
access.redhat.com/security/cve/CVE-2026-41179 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
github.com/rclone/rclone/releases/tag/v1.73.5 [email protected] github.com
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41179.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
github.com/rclone/rclone/commit/2a9e952b38e03a96bf40c9eb6e8e22199865ee3b [email protected] github.com
github.com/rclone/rclone/blob/bf55d5e6d37fd86164a87782191f9e1ffcaafa82/f... [email protected] github.com Product
github.com/rclone/rclone/security/advisories/GHSA-jfwf-28xr-xw6q 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Vendor Advisory
github.com/rclone/rclone/blob/bf55d5e6d37fd86164a87782191f9e1ffcaafa82/f... [email protected] github.com Product
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-04-23T01:01:06.930ZReported to Red Hat.
ADP2026-04-23T00:03:36.282ZMade public.
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