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rclone EUVDEUVD-2026-65539

| CVE-2026-79781 MEDIUM
Path Traversal (CWE-22)
2026-08-25 VulnCheck GHSA-98fh-ch8q-6529
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/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
vuln.today AI
6.5 MEDIUM

Network-reachable via HTTP with no auth in default config; Low C/I because traversal is bounded to serve root, not full filesystem.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Aug 25, 2026 - 17:17 EUVD
Source Code Evidence Fetched
Aug 25, 2026 - 16:17 vuln.today
Analysis Generated
Aug 25, 2026 - 16:17 vuln.today

DescriptionCVE.org

rclone serve s3 before 1.74.4 contains a path traversal vulnerability that allows attackers to read and overwrite root-level files by using dot-dot segments in S3 object keys. Attackers can send requests with object keys like ../root-secret.txt to escape the bucket namespace and access files in the serve root directory.

AnalysisAI

Path traversal in rclone's serve s3 command (versions before 1.74.4) allows unauthenticated remote attackers to both read and overwrite files at the serve root directory by embedding dot-dot sequences in S3 object keys. Go's path.Join() in the S3 backend normalizes traversal sequences that the S3 protocol treats as opaque identifiers, so a request like GET /bucket/../root-secret.txt resolves outside the intended bucket scope to a root-level file. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify internet-exposed rclone serve s3 endpoint
Delivery
Craft S3 HTTP request with dot-dot object key (e.g. /bucket/../root-secret.txt)
Exploit
path.Join normalizes traversal, resolving outside bucket namespace
Execution
Retrieve or overwrite root-level file in serve directory
Impact
Exfiltrate sensitive data or tamper with configuration

Vulnerability AssessmentAI

Exploitation Exploitation requires that the target is actively running the rclone serve s3 subcommand specifically - other rclone commands are not affected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 reflects a network-accessible (AV:N), low-complexity (AC:L), unauthenticated (PR:N) attack with no user interaction required, yielding low confidentiality and integrity impact (VC:L/VI:L) and no availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker scans for internet-exposed rclone serve s3 instances (default port 8080) and identifies one running without --auth-key (the default). Using a standard S3 client or a raw HTTP tool, they issue GET /bucket/../credentials.json to retrieve a sensitive file at the serve root that was never intended to be an S3 object. …
Remediation Upgrade rclone to version 1.74.4 or later, which resolves the path traversal via commits 83d1e62aa9e0dbd10a5d7eb34c117ae997268cdf and c89b766cf417fddbe7eace40d31262ecb85bfa93. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-65539 vulnerability details – vuln.today

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