CVE-2026-53788

rsync < 3.5.0 Newline Injection via name-converter uid/gid mapping

CVE-2026-53788 is fixed in 4 products on 1 platform, first by SUSE-SU-2026:3657-1, released August 20, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0030

23rd percentile

rsync before 3.5.0 contains a newline injection vulnerability in the name-converter uid/gid mapping interface that allows local attackers to forge protocol messages by creating user or group names containing newline characters. Attackers can inject malicious newline characters into names communicated over the pipe-based line-oriented protocol to cause the rsync daemon to process attacker-influenced data as legitimate protocol input, corrupting uid/gid mapping logic.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
rsync · Debian 13.5 (trixie)	3.5.0+ds1-0+deb13u1	DEBIAN-CVE-2026-53788	Aug 27, 2026
rsync · Debian 14	3.5.0+ds1-1	DEBIAN-CVE-2026-53788	Aug 27, 2026
rsync · amzn 2023	3.5.1-1.amzn2023.0.1	ALAS2023-2026-3131	Sep 28, 2026
rsync · opensuse-leap 16.0	3.4.1-160000.6.1	OPENSUSE-SU-2026:21650-1	Aug 26, 2026
rsync · sles 15.6	3.2.7-150600.3.24.1	SUSE-SU-2026:3657-1	Aug 20, 2026
rsync · sles 15.7	3.2.7-150600.3.24.1	SUSE-SU-2026:3657-1	Aug 20, 2026
rsync · sles 16.0	3.4.1-160000.6.1	SUSE-SU-2026:23323-1	Aug 26, 2026
rsync-daemon · amzn 2023	3.5.1-1.amzn2023.0.1	ALAS2023-2026-3131	Sep 28, 2026
rsync-debuginfo · amzn 2023	3.5.1-1.amzn2023.0.1	ALAS2023-2026-3131	Sep 28, 2026
rsync-debugsource · amzn 2023	3.5.1-1.amzn2023.0.1	ALAS2023-2026-3131	Sep 28, 2026

Details

Published
August 13, 2026
Weakness
Improper Neutralization of CRLF Sequences ('CRLF Injection')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53788

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