CVE-2026-70461: rsync 3.2.5 before 3.5.0 contains a heap out-of-bounds write vulnerability that allows remote unauthenticated

This month

HIGH 8.2REMOTEUPGRADE

CVE-2026-70461 is a high-severity flaw (CVSS 8.2) affecting rsync. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

rsync 3.2.5 before 3.5.0 contains a heap out-of-bounds write vulnerability that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of a heap allocation by supplying a crafted files-from entry. Attackers can trigger the vulnerability against a read-only rsync daemon module by providing a files-from entry containing both an interior and trailing backslash, causing the add_implied_include() function to under-c

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-787
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 15:20 UTCPublished CVE record published
2026-10-23 18:10 UTCUpdated Record last modified

samba rsync UPGRADE

Affected: >= 3.2.5 and < 3.5.0

Fixed in: 3.5.0

Safe to downgrade to: a release before 3.2.5

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.

3. If no update is available yet, DOWNGRADE to a release before 3.2.5 (Debian / Ubuntu)

apt-cache madison rsync sudo apt install rsync=<VERSION_BEFORE_3.2.5> sudo apt-mark hold rsync

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list rsync sudo dnf downgrade rsync-<VERSION_BEFORE_3.2.5> sudo dnf versionlock add rsync

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · kwin-zones · FIXED · 1.0.13-1.fc46 · FEDORA-2026-95888f332b · source

sudo dnf upgrade --advisory=FEDORA-2026-95888f332b

Fedora ELN · nginx-mod-brotli · FIXED · 1.0.0~rc-16.eln159 · FEDORA-2026-501a6a8273 · source

sudo dnf upgrade --advisory=FEDORA-2026-501a6a8273

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 · NOT AFFECTED

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-2026-70461?

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

Is CVE-2026-70461 being exploited?

CVE-2026-70461 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-2026-70461 affect?

CVE-2026-70461 affects rsync. Severity is high (CVSS 8.2). rsync 3.2.5 before 3.5.0 contains a heap out-of-bounds write vulnerability that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of a heap allocation by supplying a crafted files-from entry. Attacke

How urgent is CVE-2026-70461?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Software pages

Samba vulnerabilities

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References

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