VIR Vulnerability Intelligence Relay

CVE-2026-43617

medium
Published 2026-05-20 · Modified 2026-05-21
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
4.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4 NEW
6.3
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
VIR risk
4.8

Description

Rsync version 3.4.2 and prior contain an authorization bypass vulnerability in the rsync daemon's hostname-based access control list enforcement when configured with chroot. Attackers can bypass hostname-based deny rules by controlling the PTR record for their source IP address, allowing connections from hostnames that administrators intended to deny when reverse DNS resolution fails and defaults to UNKNOWN.

Predictions

Exploit likelihood
58%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact
suse SUSE Affected 1 release
VersionStatusFixed in
— Affected —
windows Windows Affected 1 release
VersionStatusFixed in
— Affected —
debian Debian Fixed 5 releases
VersionStatusFixed in
trixie Fixed 3.4.1+ds1-5+deb13u3
sid Fixed 3.4.3+ds1-1
forky Fixed 3.4.3+ds1-1
bullseye Fixed 3.2.3-4+deb11u4
bookworm Fixed 3.2.7-1+deb12u5

Application impact
VendorProductVersionsFixed
sambarsync{"endIncluding":"3.4.2"}

References

CWEs

CWE-289

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.