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CVE-2026-70456: rsync 3.0.1 before 3.5.0 contains an out-of-bounds write vulnerability in the read_args() function that allows

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This month
HIGH 8.2REMOTE

CVE-2026-70456 is a high-severity flaw (CVSS 8.2) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

rsync 3.0.1 before 3.5.0 contains an out-of-bounds write vulnerability in the read_args() function that allows a malicious sender to corrupt adjacent heap memory by sending a crafted argument list. When the argument count causes the argv allocation to be exactly full, the trailing NULL terminator is written one slot beyond the allocation boundary, corrupting adjacent heap memory.

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score8.2 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.4% (top 67%)
CISA exploited listNo
WeaknessCWE-787
Published2026-08-13
Last modified2026-10-23
Publisher (CNA): VulnCheck

Timeline

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 · 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-2026-70456?

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

Is CVE-2026-70456 being exploited?

CVE-2026-70456 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-2026-70456 affect?

CVE-2026-70456 affects affected software. Severity is high (CVSS 8.2). rsync 3.0.1 before 3.5.0 contains an out-of-bounds write vulnerability in the read_args() function that allows a malicious sender to corrupt adjacent heap memory by sending a crafted argument list. When the argument count causes the argv al

How urgent is CVE-2026-70456?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

References

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