CVE-2026-53798: rsync before 3.5.0 contains a privilege confusion vulnerability in the name-converter subprocess uid/gid mappi

Q: How do I fix CVE-2026-53798?

rsync: upgrade to 3.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-53798 being exploited?

CVE-2026-53798 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-53798 affect?

CVE-2026-53798 affects rsync. Severity is medium (CVSS 5.3). rsync before 3.5.0 contains a privilege confusion vulnerability in the name-converter subprocess uid/gid mapping that allows local attackers to cause transferred files to be owned by root by influencing name-converter responses to return em

Q: How urgent is CVE-2026-53798?

Priority 33/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-53798 is a medium-severity flaw (CVSS 5.3) affecting rsync. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

rsync before 3.5.0 contains a privilege confusion vulnerability in the name-converter subprocess uid/gid mapping that allows local attackers to cause transferred files to be owned by root by influencing name-converter responses to return empty values. When the name-converter subprocess returns an empty response for a uid or gid lookup, rsync incorrectly interprets it as a successful resolution to uid/gid 0 (root) rather than a lookup failure, and

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-704
Published	2026-08-13
Last modified	2026-10-23

Publisher (CNA): VulnCheck · Vendor: samba

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-13 15:19 UTCPublished CVE record published
2026-10-23 18:10 UTCUpdated Record last modified

samba rsync UPGRADE

Affected: < 3.5.0

Fixed in: 3.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy rsync || rpm -q rsync || rsync --version

2. UPGRADE to 3.5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rsync

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rsync

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · wasmedge · FIXED · 0.18.1-1.fc46 · FEDORA-2026-4c27216e39 · source

sudo dnf upgrade --advisory=FEDORA-2026-4c27216e39

Debian 12 · rsync · NO FIX YET

Debian 13 · rsync · FIXED · 3.5.0+ds1-0+deb13u1

sudo apt update && sudo apt install --only-upgrade rsync dpkg --compare-versions "$(dpkg-query -W -f='${Version}' rsync)" ge "3.5.0+ds1-0+deb13u1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 10 · rsync · DEFERRED

RHEL 6 · rsync · NOT AFFECTED

RHEL 7 · rsync · NOT AFFECTED

RHEL 8 · rsync · NOT AFFECTED

RHEL 9 · rsync · DEFERRED

Alpine 3.21 · rsync · FIXED · rsync-3.5.0-r0

apk add --upgrade rsync apk info -v rsync

Alpine 3.22 · rsync · FIXED · rsync-3.5.0-r0

apk add --upgrade rsync apk info -v rsync

Alpine 3.23 · rsync · FIXED · rsync-3.5.0-r0

apk add --upgrade rsync apk info -v rsync

Alpine 3.24 · rsync · FIXED · rsync-3.5.0-r0

apk add --upgrade rsync apk info -v rsync

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-3131 · source

sudo dnf update --advisory=ALAS2023-2026-3131

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-53798?

rsync: upgrade to 3.5.0. Exact commands for each OS are on this page.

Is CVE-2026-53798 being exploited?

CVE-2026-53798 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-53798 affect?

CVE-2026-53798 affects rsync. Severity is medium (CVSS 5.3). rsync before 3.5.0 contains a privilege confusion vulnerability in the name-converter subprocess uid/gid mapping that allows local attackers to cause transferred files to be owned by root by influencing name-converter responses to return em

How urgent is CVE-2026-53798?

Priority 33/100. Remotely exploitable, no login, no user action

Software pages

Samba vulnerabilities

Related CVEs

CVE-2026-70463 HIGH 8.1 UPGRADE rsync 3.1.0 before 3.5.0 contains an authorization bypass in auth users directive parsing
CVE-2026-53791 CRITICAL 9.1 UPGRADE rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote att
CVE-2026-70461 HIGH 8.2 UPGRADE rsync 3.2.5 before 3.5.0 contains a heap out-of-bounds write vulnerability that allows remote unauthenticated
CVE-2026-70455 HIGH 7.5 UPGRADE rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows a remote sender to exhaust sys
CVE-2026-53795 HIGH 8.1 UPGRADE rsync before 3.5.0 contains an arbitrary file write vulnerability that allows attackers to write files outside

References

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