markdown-it-py crash on null assertions
Priority LOW 24CWE-173Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.
Summary
Denial of service could be caused to markdown-it-py, before v2.2.0, if an attacker was allowed to force null assertions with specially crafted input.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00225 13th percentileScored 2026-11-07
Fix Partial markdown-it-py (Executable Books): v2.2.0markdown-it-py (PyPI): 2.2.0Red Hat: 1 without a fix
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 |
|---|---|---|---|---|---|
| Executable Books | markdown-it-py | before v2.2.0 | v2.2.0 | Patch available | CNA |
| — | markdown-it-py (PyPI) | before 2.2.0 | 2.2.0 | Patch available | GHSA-vrjv-mxr7-vjf8 |
- markdown-it-py VendorExecutable Books Affected before v2.2.0 Fixed in v2.2.0 Patch available CNA
- markdown-it-py (PyPI) Vendor— Affected before 2.2.0 Fixed in 2.2.0 Patch available GHSA-vrjv-mxr7-vjf8
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:executablebooks:markdown-it-py:*:*:*:*:*:*:*:* | before 2.2.0 | Vulnerable | Executable Books |
- cpe:2.3:a:executablebooks:markdown-it-py:*:*:*:*:*:*:*:* Versions before 2.2.0 Vulnerable ·Executable Books
Remediation
- Fix · CNA markdown-it-py (Executable Books) Fixed in v2.2.0
- Fix · GHSA-vrjv-mxr7-vjf8 markdown-it-py (PyPI) Fixed in 2.2.0 Advisory →
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Executable Books markdown-it-py v2.2.0
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2023-11462 markdown-it-py CLI crash on invalid UTF-8 charactersPriority LOW 24
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-26303
- 2026-10-03 Alias added: GHSA-vrjv-mxr7-vjf8
References
Patch 1
Other 4
More Executable Books Markdown-it-py vulnerabilities
- TI-2023-11462 markdown-it-py CLI crash on invalid UTF-8 characters CVSS 3.1MEDIUM 5.5
Sources
- CVE-2023-26303 · CVE Program
- CVE-2023-26303 · NVD
- FIRST EPSS
- GHSA-vrjv-mxr7-vjf8 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-26303 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences