CVE-2026-43620

Publication date 20 May 2026

Last updated 2 June 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.5 · Medium

Score breakdown

Description

Rsync version 3.4.2 and prior contain a receiver-side out-of-bounds array read vulnerability in recv_files() in receiver.c that allows a malicious rsync server to crash the rsync client process. Attackers can exploit the vulnerability by setting CF_INC_RECURSE in compatibility flags and sending a specially crafted file list where the first sorted entry is not the leading dot directory, followed by a transfer record with ndx=0 and an iflag word without ITEM_TRANSFER, causing the receiver to read 8 bytes before the allocated pointer array and dereference an invalid pointer at an unmapped address, resulting in a deterministic SIGSEGV crash of the rsync client.

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

References

Related Ubuntu Security Notices (USN)

Other references

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