CVE-2026-41035: In rsync 3.0.1 through 3.4.1, receive_xattr relies on an untrusted length value during a qsort call, leading t

Routine

HIGH 7.4UPGRADE

CVE-2026-41035 is a high-severity flaw (CVSS 7.4) affecting rsync. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In rsync 3.0.1 through 3.4.1, receive_xattr relies on an untrusted length value during a qsort call, leading to a receiver use-after-free. The victim must run rsync with -X (aka --xattrs). On Linux, many (but not all) common configurations are vulnerable. Non-Linux platforms are more widely vulnerable.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-130, CWE-805
Published	2026-04-16
Last modified	2026-10-26

Publisher (CNA): MITRE · Vendor: samba

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-16 07:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

samba rsync UPGRADE

Affected: >= 3.0.1 and <= 3.4.1

Fixed in: newer than 3.4.1

Safe to downgrade to: a release before 3.0.1

1. Check installed version

apt-cache policy rsync || rpm -q rsync || rsync --version

2. UPGRADE to newer than 3.4.1 (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 3.0.1 (Debian / Ubuntu)

apt-cache madison rsync sudo apt install rsync=<VERSION_BEFORE_3.0.1> 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_3.0.1> 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.

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:19368] Important: rsync security update 2026-05-26

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-2026-41035?

rsync: upgrade to newer than 3.4.1. Exact commands for each OS are on this page.

Is CVE-2026-41035 being exploited?

CVE-2026-41035 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-2026-41035 affect?

CVE-2026-41035 affects rsync. Severity is high (CVSS 7.4). In rsync 3.0.1 through 3.4.1, receive_xattr relies on an untrusted length value during a qsort call, leading to a receiver use-after-free. The victim must run rsync with -X (aka --xattrs). On Linux, many (but not all) common configurations

How urgent is CVE-2026-41035?

Priority 39/100. High severity; Public exploit reference

Software pages

Samba vulnerabilities

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References

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