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CVE-2026-53788: rsync before 3.5.0 contains a newline injection vulnerability in the name-converter uid/gid mapping interface

32
Routine
MEDIUM 6.5REMOTE

CVE-2026-53788 is a medium-severity flaw (CVSS 6.5) affecting affected software. 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 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 ui

Why this priority

  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 81%)
CISA exploited listNo
WeaknessCWE-93
Published2026-08-13
Last modified2026-10-23
Publisher (CNA): VulnCheck

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

Timeline

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-2026-53788?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-53788 being exploited?

CVE-2026-53788 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-2026-53788 affect?

CVE-2026-53788 affects affected software. Severity is medium (CVSS 6.5). 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 ca

How urgent is CVE-2026-53788?

Priority 32/100. Remotely exploitable, no login, no user action

References

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