CVE-2026-105646
Received Received - Intake

Ghost CMS Denial of Service via Malicious Content Import

Publication date: 2026-10-05

Last updated on: 2026-10-05

Assigner: GitHub, Inc.

Description
Ghost is a Node.js content management system. From 4.0.0 until 6.67.0, a crafted content import file could cause excessive CPU usage, making the Ghost server unresponsive. Exploiting this requires Administrator access. This issue is fixed in version 6.67.0.

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Meta Information

Published
2026-10-05
Last Modified
2026-10-05
Generated
2026-10-05
AI Q&A
2026-10-05
EPSS Evaluated
N/A
NVD
CVE-2026-105646
EUVD
EUVD-2026-92636

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
TryGhost Ghost >= 4.0.0, < 6.67.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-1333 The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.

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Executive Summary

This vulnerability is a Regular Expression Denial of Service (ReDoS) issue in Ghost CMS versions 4.0.0 to 6.65.0. A crafted content import file can cause excessive CPU usage, making the server unresponsive. It requires Administrator access to exploit and was fixed in version 6.67.0.

Detection Guidance

Detecting this vulnerability requires monitoring for excessive CPU usage during Ghost import operations. Check Ghost server logs for import processes that hang or consume abnormally high CPU. Use system monitoring tools like top, htop, or ps to observe CPU spikes during import tasks. If Ghost is running in Docker, use docker stats to monitor container resource usage.

Impact Analysis

The vulnerability can make your Ghost server unresponsive due to high CPU usage, disrupting service availability. Since it requires Administrator access, only users with elevated privileges can exploit it. Self-hosted users should update to version 6.67.0 or later to mitigate the risk.

Compliance Impact

This vulnerability primarily impacts availability by causing excessive CPU usage, which could lead to server unresponsiveness. It does not directly affect confidentiality or integrity of data. Compliance impact depends on system downtime duration and data accessibility during incidents. Standards like GDPR and HIPAA require maintaining data availability and security, so prolonged outages could pose compliance risks if they disrupt access to personal or health data.

Mitigation Strategies

Update Ghost to version 6.67.0 or later immediately. For self-hosted users, use Docker or Ghost-CLI to apply the patch.

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