CVE-2026-43617

Publication date 20 May 2026

Last updated 2 June 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.8 · Medium

Score breakdown

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.

Status

Package Ubuntu Release Status
rsync 26.04 LTS resolute
Fixed 3.4.1+ds1-7ubuntu0.2
25.10 questing
Fixed 3.4.1+ds1-5ubuntu1.2
24.04 LTS noble
Fixed 3.2.7-1ubuntu1.4
22.04 LTS jammy
Fixed 3.2.7-0ubuntu0.22.04.6
20.04 LTS focal
Fixed 3.1.3-8ubuntu0.9+esm1
18.04 LTS bionic
Fixed 3.1.2-2.1ubuntu1.6+esm3
16.04 LTS xenial
Fixed 3.1.1-3ubuntu1.3+esm5
14.04 LTS trusty
Fixed 3.1.0-2ubuntu0.4+esm3

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Severity score breakdown

Parameter Value
Base score 4.8 · Medium
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

Other references

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