CVE-2026-70452: rsync 3.1.0 before 3.5.0 contains an access control bypass vulnerability that allows remote attackers to circu

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HIGH 7.4REMOTE

CVE-2026-70452 is a high-severity flaw (CVSS 7.4) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

rsync 3.1.0 before 3.5.0 contains an access control bypass vulnerability that allows remote attackers to circumvent hosts deny rules by inducing DNS resolution failures during hostname-based access control evaluation. When a DNS lookup for a hostname-based deny rule fails, the daemon skips the rule rather than defaulting to a deny decision, enabling attackers who can trigger DNS failures to bypass module-level IP access controls and gain unauthor

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-636, CWE-863
Published	2026-08-13
Last modified	2026-10-23

Publisher (CNA): VulnCheck

Timeline

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

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.

References

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