CVE-2026-105646: CWE-1333: Inefficient Regular Expression Complexity in TryGhost Ghost
Description
CVE-2026-105646 is a vulnerability in the TryGhost Ghost content management system affecting versions from 4.0.0 up to but not including 6.67.0. It involves inefficient regular expression complexity triggered by a crafted content import file, which can cause excessive CPU usage and render the Ghost server unresponsive. Exploitation requires administrator privileges. The issue is resolved in version 6.67.0.
CVSS v3.1
Score 4.9medium
Affected software
TryGhost
Ghost
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Ghost, a Node.js CMS, has a vulnerability (CVE-2026-105646) classified as CWE-1333 (Inefficient Regular Expression Complexity) affecting versions >=4.0.0 and <6.67.0. A crafted content import file can cause excessive CPU consumption leading to denial of service by making the server unresponsive. Exploitation requires administrator-level access. The vulnerability has a CVSS 3.1 base score of 4.9 (medium severity) with network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high availability impact. The issue is fixed in version 6.67.0.
Potential Impact
Successful exploitation results in denial of service due to excessive CPU usage, causing the Ghost server to become unresponsive. There is no impact on confidentiality or integrity. The attack requires administrator privileges, limiting the attack surface.
Mitigation Recommendations
Upgrade Ghost to version 6.67.0 or later to remediate this vulnerability. Since the issue is fixed in this version, applying the official update fully mitigates the risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-05T16:40:39.613Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac3f4a92cdf04f6562ec8d8
Added to database: 10/05/2026, 19:04:09 UTC
Last enriched: 10/05/2026, 19:18:18 UTC
Last updated: 10/05/2026, 19:19:10 UTC
Views: 10
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