CVE-2026-29518

Publication date 20 May 2026

Last updated 2 June 2026

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

7.0 · High

Score breakdown

Description

Rsync versions before 3.4.3 contain a time-of-check to time-of-use (TOCTOU) race condition in daemon file handling that allows attackers to redirect file writes outside intended directories by replacing parent directory components with symbolic links. Attackers with write access to a module path can exploit this race condition to create or overwrite arbitrary files, potentially modifying sensitive system files and achieving privilege escalation when the daemon runs with elevated privileges. This vulnerability can only be triggered if the chroot setting is false.

Why is this CVE high priority?

rsync developers have rated this as being a high severity issue

Learn more about Ubuntu priority

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 7.0 · High
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references

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