Medium severity · published Aug 25, 2026
CVE-2026-79781
rclone serve s3 Path Traversal via dot-dot object keys
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RC
rclone · rclone
before 1.74.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-79781
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-79781
github.com
https://github.com/rclone/rclone/security/advisories/GHSA-8v25-v8p6-qf7v
www.vulncheck.com
https://www.vulncheck.com/advisories/rclone-serve-s3-path-traversal-via-dot-dot-object-keys
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