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The security vulnerability designated as CVE-2026-105645 affects the Ghost content management system, specifically within its external media inliner component. The flaw stems from inefficient regular expression complexity (CWE-1333) when parsing specific external media inputs or structured strings. When an authenticated administrator submits a maliciously crafted request containing inputs designed to trigger catastrophic backtracking, the underlying Node.js application process consumes excessive CPU cycles. Because JavaScript operates on a single-threaded event loop, this intensive computational overhead blocks normal processing routines, locks up worker threads, and leaves the entire Ghost instance completely unresponsive, achieving a classic denial of service (ReDoS) condition. Mitigation requires updating the application codebase to version 6.67.0 or higher, where regular expression evaluations are properly bounded or refactored.
DailyCVE Form:
Platform: Ghost CMS
Version: v5.37.0 to v6.65.0
Vulnerability : ReDoS (Regular Expression Denial of Service)
Severity: Moderate
date: October 1, 2026
Prediction: October 1, 2026
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Analysis of the patch commit reveals inefficient pattern matching strings within the media parsing module that fail to handle nested quantifiers. When processing malicious payloads, the regex engine enters exponential backtracking states, spiking CPU utilization to 100 percent.
Bash Commands and Codes
Check current installed version of Ghost ghost version Update Ghost CLI and instance to patched version 6.67.0 or later ghost update 6.67.0 For Docker deployments, pull the updated official image docker pull ghost:latest docker compose up -d
Exploit: (Educational Purposes!)
// Conceptual ReDoS payload simulation for vulnerable external media inliner const maliciousInput = '<img src="http://example.com/image.jpg" alt="' + 'a'.repeat(50000) + '" />'; // Submitting this via administrator context triggers catastrophic backtracking in regex evaluation
Protection: from this CVE
Upgrade your Ghost installation immediately to version 6.67.0 or later using the Ghost-CLI tool or by pulling the updated container images for Docker deployments. Ensure strict access controls are maintained to limit administrator privileges only to trusted personnel, mitigating potential internal abuse vectors.
Impact
Successful exploitation of this flaw leads to a total denial of service for the target blogging platform. Although the attack requires administrative privileges, an authenticated malicious actor or a compromised admin account can render the server completely unresponsive, halting publishing workflows and disrupting overall service availability for site visitors.
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Sources:
Reported By: github.com
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