Regular expression denial of service in Ghost external media inliner
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
Ghost, a Node.js content management system, is affected from 5.37.0 before 6.67.0. An inefficient regular expression (CWE-1333) lets a crafted request to the external media inliner consume excessive CPU, making the Ghost server unresponsive. An attacker with Administrator access can trigger it.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
Ghost is a Node.js content management system. From 5.37.0 until 6.67.0, a crafted request to the external media inliner could cause excessive CPU usage, making the Ghost server unresponsive. Exploiting this requires Administrator access. This issue is fixed in version 6.67.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| TryGhost | Ghost | 5.37.0 to before 6.67.0 | 6.67.0 | Patch available | CNA |
| — | ghost (npm) | 5.37.0 to before 6.67.0 | 6.67.0 | Patch available | GHSA-9m4w-fmjw-fvjq |
- Ghost VendorTryGhost Affected 5.37.0 to before 6.67.0 Fixed in 6.67.0 Patch available CNA
- ghost (npm) Vendor— Affected 5.37.0 to before 6.67.0 Fixed in 6.67.0 Patch available GHSA-9m4w-fmjw-fvjq
Remediation
Upgrade Ghost to version 6.67.0, which fixes this issue. The npm package ghost is fixed in 6.67.0.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
- Fix · CNA Ghost (TryGhost) Fixed in 6.67.0
- Fix · GHSA-9m4w-fmjw-fvjq ghost (npm) Fixed in 6.67.0 Advisory →
Timeline
- 2026-10-05 Threatist record created from CVE-2026-105645
- 2026-10-05 CISA SSVC decision points changed
- 2026-10-07 Alias added: GHSA-9m4w-fmjw-fvjq
- 2026-10-07 Fix available: npm/[email protected] · GHSA-9m4w-fmjw-fvjq
- 2026-10-07 CVSS score added · GHSA-9m4w-fmjw-fvjq
- 2026-10-07 Weakness changed · GHSA-9m4w-fmjw-fvjq
- 2026-10-07 7 new references · GHSA-9m4w-fmjw-fvjq
References
Other 6
- https://github.com/TryGhost/Ghost/security/advisories/GHSA-9m4w-fmjw-fvjq
- https://github.com/TryGhost/Ghost/issues/31058
- https://github.com/TryGhost/Ghost/commit/88ae6d6d56f8a239cb38a8c89de02f034f50e2ce
- https://github.com/TryGhost/Ghost/releases/tag/v6.66.0
- https://github.com/TryGhost/Ghost/pull/31058
- https://github.com/TryGhost/Ghost
More TryGhost vulnerabilities
- TI-2026-21459 Ghost has a SQL Injection in its Content API CVSS 3.1CRITICAL 9.4
- TI-2022-10277 An arbitrary file upload vulnerability in the file upload module of Ghost v4.39.0 allows… CVSS 3.1CRITICAL 9.8
- TI-2024-22785 Ghost through 5.85.1 allows remote attackers to bypass an authentication rate-limit… CVSS 3.1CRITICAL 9.1
- TI-2023-14843 Ghost vulnerable to disclosure of private API fields CVSS 3.1HIGH 7.5
- TI-2025-09049 Ghost 6.0.6 - SSRF via oEmbed Bookmark CVSS 4.0MEDIUM 6.1
- TI-2023-20918 Arbitrary file read via symlinks in Ghost CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-105645 · CVE Program
- CVE-2026-105645 · NVD
- FIRST EPSS
- GHSA-9m4w-fmjw-fvjq · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences