Medium [CVE-2026-79781] Path Traversal allows unauthorized file access
This medium-severity Red Hat Linux advisory covers CVE-2026-79781 affecting Cryostat 4, Red Hat Advanced Cluster Management for Kubernetes 2.
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Summary
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.
A flaw was found in rclone. This could lead to unauthorized access and modification of critical system files.
Moderate: This path traversal flaw in `rclone` allows remote attackers to read and overwrite arbitrary files outside the intended S3 bucket when the `rclone serve s3` command is actively exposed. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).
Weakness: CWE-22. Affected Red Hat products: Cryostat 4; Red Hat Advanced Cluster Management for Kubernetes 2.
Red Hat does not currently list a fixing RHSA for this CVE.
- < 1.74.4
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Mitigation checklist
- To mitigate this issue, do not run rclone serve s3 with anonymous access. Configure S3 serve authentication using --auth-key, do not place sensitive files at the serve root outside intended bucket directories, and avoid exposing rclone serve s3 to untrusted networks.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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