EUVD-2026-65539
GHSA-98fh-ch8q-6529
Severity by source
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
Network-reachable via HTTP with no auth in default config; Low C/I because traversal is bounded to serve root, not full filesystem.
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
Lifecycle Timeline
3DescriptionCVE.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
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. |
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
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