What is CVE-2026-105646?

CVE-2026-105646 is a medium-severity vulnerability in Tryghost Ghost, classified under Inefficient Regular Expression Complexity. CVSS score: 4.9/10. Published 2026-10-05.

How severe is CVE-2026-105646?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Vulnerability in Tryghost Ghost

CVE-2026-105646

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.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

Published 2026-10-05 · last modified 2026-10-06.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Tryghost Ghost — versions >= 4.0.0, < 6.67.0

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

Frequently asked questions

What is CVE-2026-105646?: CVE-2026-105646 is a medium-severity vulnerability in Tryghost Ghost, classified under Inefficient Regular Expression Complexity. CVSS score: 4.9/10. Published 2026-10-05.
How severe is CVE-2026-105646?: Medium severity. CVSS v3 base score is 4.9 out of 10.