CVE-2026-53783: rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync

Routine

HIGH 8.1

CVE-2026-53783 is a high-severity flaw (CVSS 8.1) 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 time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and --log-file through rrsync to read or write files o

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-59, CWE-88
Published	2026-08-13
Last modified	2026-10-23

Publisher (CNA): VulnCheck

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

Timeline

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

Exact fixes by distribution

Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source

sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0

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 · FIXED · rsync-3.5.0-3.el10_2

sudo dnf upgrade --advisory=RHSA-2026:67463 rpm -q rsync

RHEL 8 · rsync · FIXED · rsync-3.1.3-28.el8_10

sudo dnf upgrade --advisory=RHSA-2026:74095 rpm -q rsync

RHEL 9 · rsync · FIXED · rsync-3.2.7-1.el9_8

sudo dnf upgrade --advisory=RHSA-2026:67462 rpm -q rsync

RHEL 6 · rsync · NO FIX YET

RHEL 7 · rsync · NO FIX YET

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-2026-53783?

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

Is CVE-2026-53783 being exploited?

CVE-2026-53783 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-2026-53783 affect?

CVE-2026-53783 affects affected software. Severity is high (CVSS 8.1). rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink fo

How urgent is CVE-2026-53783?

Priority 36/100. High severity

References

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