High [CVE-2026-53795] Arbitrary file write via --temp-dir or --link-dest options
This high-severity Red Hat Linux advisory covers CVE-2026-53795.
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Summary
A flaw was found in rsync. A remote attacker can exploit this vulnerability by specifying an absolute path using the `--temp-dir` or `--link-dest` options.
This bypasses the rename-confinement logic, allowing the attacker to write files to arbitrary locations outside the intended destination tree, potentially leading to unauthorized data modification or system disruption. The requirement for user interaction to supply malicious input prevents this from being a Critical severity issue.
Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H). Weakness: CWE-59.
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 42 minutes ago·verify at source
- 3.5.0
Official advisory · high-confidence parse· fetched 42 minutes ago·verify at source
Mitigation checklist
- Do not pass untrusted values into --temp-dir or --link-dest. If you need those options, keep the destination (and those dirs) free of writes by untrusted users so a parent cannot be swapped to a symlink. Do not use --partial-dir or --inplace when pulling from an untrusted server. If rsyncd runs with use chroot = no, restrict who can connect.
Official advisory · high-confidence parse· fetched 42 minutes ago·verify at source
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