High [CVE-2026-70452] rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure
This high-severity Red Hat Linux advisory covers CVE-2026-70452 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 7.
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Summary
rsync 3.1.0 before 3.5.0 contains an access control bypass vulnerability that allows remote attackers to circumvent hosts deny rules by inducing DNS resolution failures during hostname-based access control evaluation.
When a DNS lookup for a hostname-based deny rule fails, the daemon skips the rule rather than defaulting to a deny decision, enabling attackers who can trigger DNS failures to bypass module-level IP access controls and gain unauthorized access to restricted module file trees. A flaw was found in rsync.
Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-636.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4. Red Hat lists Red Hat Enterprise Linux 6 as not affected.
Red Hat fixing advisory: RHSA-2026:67463, RHSA-2026:67462.
Affected products named by the advisory: Red Hat package: rsync.
- < 3.1.0
- < 3.5.0
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
- 3.5.0
- rsync-0:3.5.0-3.el10_2
- rsync-0:3.2.7-1.el9_8
- RHSA-2026:67463
- RHSA-2026:67462
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Mitigation checklist
- To mitigate this issue, configure rsync to use IP-based access controls instead of hostname-based rules in `rsyncd.conf`. Alternatively, restrict network access to the rsync daemon using firewall rules to allow connections only from trusted IP addresses or networks. This limits exposure by preventing untrusted remote attackers from reaching the service and attempting to induce DNS resolution failures. If changes are made to `rsyncd.conf`, the rsync daemon may need to be restarted or reloaded for the changes to take effect.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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