CVE-2026-39846: SiYuan is a personal knowledge management system

Q: How do I fix CVE-2026-39846?

siyuan: upgrade to 3.6.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-39846 being exploited?

CVE-2026-39846 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39846 affect?

CVE-2026-39846 affects siyuan. Severity is critical (CVSS 9.0). SiYuan is a personal knowledge management system. Prior to 3.6.4, a malicious note synced to another user can trigger remote code execution in the SiYuan Electron desktop client. The root cause is that table caption content is stored withou

Q: How urgent is CVE-2026-39846?

Priority 48/100. Critical severity; Public exploit reference

This month

CRITICAL 9.0UPGRADE

CVE-2026-39846 is a critical-severity flaw (CVSS 9.0) affecting siyuan. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SiYuan is a personal knowledge management system. Prior to 3.6.4, a malicious note synced to another user can trigger remote code execution in the SiYuan Electron desktop client. The root cause is that table caption content is stored without safe escaping and later unescaped into rendered HTML, creating a stored XSS sink. Because the desktop renderer runs with nodeIntegration enabled and contextIsolation disabled, attacker-controlled JavaScript e

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-79, CWE-94
Published	2026-04-07
Last modified	2026-07-20

Publisher (CNA): GitHub, Inc. · Vendor: b3log

Last updated 2026-07-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 22:16 UTCPublished CVE record published
2026-07-20 20:10 UTCUpdated Record last modified

b3log siyuan UPGRADE

Affected: < 3.6.4

Fixed in: 3.6.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.6.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade siyuan

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-39846?

siyuan: upgrade to 3.6.4. Exact commands for each OS are on this page.

Is CVE-2026-39846 being exploited?

CVE-2026-39846 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-2026-39846 affect?

CVE-2026-39846 affects siyuan. Severity is critical (CVSS 9.0). SiYuan is a personal knowledge management system. Prior to 3.6.4, a malicious note synced to another user can trigger remote code execution in the SiYuan Electron desktop client. The root cause is that table caption content is stored withou

How urgent is CVE-2026-39846?

Priority 48/100. Critical severity; Public exploit reference

Software pages

Electron vulnerabilities

Related CVEs

CVE-2026-40922 MEDIUM 5.4 UPGRADE SiYuan is an open-source personal knowledge management system
CVE-2026-40322 CRITICAL 9.0 UPGRADE SiYuan is an open-source personal knowledge management system
CVE-2026-40318 HIGH 8.5 UPGRADE SiYuan is an open-source personal knowledge management system
CVE-2026-40259 HIGH 8.1 UPGRADE SiYuan is an open-source personal knowledge management system
CVE-2026-40107 MEDIUM 6.5 UPGRADE SiYuan is a personal knowledge management system

References

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