CVE-2026-21575: This High severity RCE (Remote Code Execution) vulnerability was introduced in version 3.4.11 of Sourcetree fo

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HIGH 8.0UPGRADEUPGRADE

CVE-2026-21575 is a high-severity flaw (CVSS 8.0) affecting sourcetree, sourcetree. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This High severity RCE (Remote Code Execution) vulnerability was introduced in version 3.4.11 of Sourcetree for Mac and Sourcetree for Windows. This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to execute arbitrary code which has high impact to confidentiality, high impact to integrity, high impact to availability, and requires user interaction. Atlassian recommends that Sourcetree

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.0 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-07-21
Last modified	2026-10-24

Publisher (CNA): Atlassian · Vendor: atlassian

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-21 18:16 UTCPublished CVE record published
2026-10-24 19:10 UTCUpdated Record last modified

atlassian sourcetree UPGRADE

Affected: >= 3.4.11 and < 3.4.13

Fixed in: 3.4.13

Safe to downgrade to: a release before 3.4.11

1. Check installed version

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

2. UPGRADE to 3.4.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sourcetree

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sourcetree

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 3.4.11 (Debian / Ubuntu)

apt-cache madison sourcetree sudo apt install sourcetree=<VERSION_BEFORE_3.4.11> sudo apt-mark hold sourcetree

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

dnf --showduplicates list sourcetree sudo dnf downgrade sourcetree-<VERSION_BEFORE_3.4.11> sudo dnf versionlock add sourcetree

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.

atlassian sourcetree UPGRADE

Affected: >= 3.4.11 and < 3.4.13

Fixed in: 3.4.13

Safe to downgrade to: a release before 3.4.11

1. Check installed version

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

2. UPGRADE to 3.4.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sourcetree

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sourcetree

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 3.4.11 (Debian / Ubuntu)

apt-cache madison sourcetree sudo apt install sourcetree=<VERSION_BEFORE_3.4.11> sudo apt-mark hold sourcetree

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

dnf --showduplicates list sourcetree sudo dnf downgrade sourcetree-<VERSION_BEFORE_3.4.11> sudo dnf versionlock add sourcetree

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.

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-2026-21575?

sourcetree: upgrade to 3.4.13; sourcetree: upgrade to 3.4.13. Exact commands for each OS are on this page.

Is CVE-2026-21575 being exploited?

CVE-2026-21575 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-2026-21575 affect?

CVE-2026-21575 affects sourcetree, sourcetree. Severity is high (CVSS 8.0). This High severity RCE (Remote Code Execution) vulnerability was introduced in version 3.4.11 of Sourcetree for Mac and Sourcetree for Windows. This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 7.1, allows an authenti

How urgent is CVE-2026-21575?

Priority 40/100. High severity

Software pages

Windows vulnerabilities

References

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