Medium [CVE-2026-88046] Unauthorized data modification via path traversal in source object names
This medium-severity Red Hat Linux advisory covers CVE-2026-88046 affecting Cryostat 4, Red Hat Advanced Cluster Management for Kubernetes 2.
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Summary
A flaw was found in rclone, a command-line program for syncing files. This vulnerability allows an attacker to bypass configured directory restrictions by including parent-directory segments (e.g., '..') in source object names.
When a specially crafted source object is uploaded or copied, it can enable unauthorized access or modification of data outside the intended storage location. This could lead to data being written to unintended buckets, shares, or filesystem paths accessible by the victim's credentials.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/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.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- This flaw requires an untrusted, flat-keyspace source object store, populated by tooling other than rclone, that contains a raw .. key segment. Syncs or copies from such sources should avoid destination backends that construct paths with path.Join(root, remote): b2, swift, qingstor, oracleobjectstorage, internetarchive, smb, storj, sftp, webdav, ftp, filelu, shade, and sia. Restricting untrusted-source syncs to destinations outside this list, or auditing source object keys for .. segments beforehand, prevents the path traversal until rclone is upgraded to 1.75.1.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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