CVE-2025-6492
📋 TL;DR
This vulnerability in MarkText allows remote attackers to cause denial of service through inefficient regular expression complexity in the getRecommendTitleFromMarkdownString function. Attackers can exploit this by sending specially crafted markdown content, potentially causing the application to become unresponsive. Users of MarkText versions up to 0.17.1 are affected.
💻 Affected Systems
- MarkText
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete application denial of service, making MarkText unusable and potentially affecting system stability if the process consumes excessive resources.
Likely Case
Temporary application unresponsiveness or crashes when processing malicious markdown content, requiring restart of the application.
If Mitigated
Minimal impact with proper input validation and resource limits in place.
🎯 Exploit Status
Exploit code has been publicly disclosed and requires minimal technical skill to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.18.0 or later
Vendor Advisory: https://github.com/marktext/marktext/pull/3952
Restart Required: Yes
Instructions:
1. Download MarkText 0.18.0 or later from official sources. 2. Uninstall previous version. 3. Install new version. 4. Restart system if prompted.
🔧 Temporary Workarounds
Avoid untrusted markdown content
allDo not open or process markdown files from untrusted sources
Use alternative markdown editor
allTemporarily use a different markdown editor until patched
🧯 If You Can't Patch
- Implement network segmentation to limit access to MarkText instances
- Monitor system resources for unusual CPU/memory spikes when using MarkText
🔍 How to Verify
Check if Vulnerable:
Check MarkText version in Help > About menu. If version is 0.17.1 or earlier, you are vulnerable.Check Version:
On Linux/macOS: marktext --version or check About menu in GUIVerify Fix Applied:
After updating, verify version is 0.18.0 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Application crashes
- High CPU usage spikes
- Out of memory errors
Network Indicators:
- Unusual markdown file downloads
- Repeated application restart attempts
SIEM Query:
process_name:"MarkText" AND (event_type:"crash" OR cpu_usage:>90)