CVE-2026-43617

medium Red Hat
CVSS v3 Base Score
4.2
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS Score
0.0%
Exploitation probability in 30 days
Top 97% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Published: May 20, 2026 (51 days ago)
Last Modified: May 20, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in rsync. When an rsync daemon is configured with "daemon chroot = /X" and uses hostname-based access control lists (ACLs), and the chrooted directory /X lacks necessary DNS resolution files, a remote attacker can bypass hostname-based deny rules. This occurs because the daemon performs reverse-DNS lookups after chrooting, causing the lookup to fail and the connecting hostname to be identified as "UNKNOWN". An attacker can exploit this by controlling their pointer (PTR) record, enabling unauthorized connections from hostnames that should have been denied.

CWE

CWE-289

Affected Products

Red Hat Enterprise Linux 10Red Hat Enterprise Linux 6Red Hat Enterprise Linux 7Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9Red Hat OpenShift Container Platform 4

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov