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.
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
Summary
A flaw was found in rsync. This vulnerability allows a remote attacker to bypass hostname-based access control rules.
By inducing DNS resolution failures, the rsync daemon incorrectly skips deny rules, granting unauthorized access to restricted module file trees. 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 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 47 minutes ago·verify at source
- 3.5.0
Official advisory · high-confidence parse· fetched 47 minutes 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 47 minutes ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.