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GHSA-4r66-7rcv-x46x

HighCVSS 8.6 / 10
Published Dec 9, 2025·Last modified Dec 15, 2025
Affected Components(0)

No affected components available

Description

Summary

Siyuan is vulnerable to RCE. The issue stems from a "Zip Slip" vulnerability during zip file extraction, combined with the ability to overwrite system executables and subsequently trigger their execution.

Steps to reproduce

  1. Authenticate
  2. Create zip slip payload with path traversal entry ../../../../opt/siyuan/startup.sh. startup.sh contains malicious code like:
#!/bin/sh
echo 'you have been pwned' > /siyuan/workspace/data/pwned.txt
echo "pandoc 3.1.0"
  1. Upload zip to workspace via /api/file/putFile
  2. Extract zip via /api/archive/unzip, overwrites the existing executable startup.sh while maintaining the +x permission
  3. Trigger execution by calling /api/setting/setExport with pandocBin=/opt/siyuan/startup.sh. This calls IsValidPandocBin() which executes startup.sh --version that outputs "pandoc 3.1.0" and executes any arbitrary malicious code
Risk Scores
Base Score
8.6

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
6.1

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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