python-markdownify (aka markdownify) before 0.14.1 allows large headline prefixes such as…
Priority MEDIUM 49CWE-1284Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
python-markdownify (aka markdownify) before 0.14.1 allows large headline prefixes such as <h9999999> in addition to <h1> through <h6>. This causes memory consumption.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0022 12th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed python-markdownify (python-markdownify): 0.14.1markdownify (PyPI): 0.14.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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 |
|---|---|---|---|---|---|
| python-markdownify | python-markdownify | before 0.14.1 | 0.14.1 | Patch available | CNA |
| — | markdownify (PyPI) | before 0.14.1 | 0.14.1 | Patch available | GHSA-7mpr-5m44-h73r |
- python-markdownify Vendorpython-markdownify Affected before 0.14.1 Fixed in 0.14.1 Patch available CNA
- markdownify (PyPI) Vendor— Affected before 0.14.1 Fixed in 0.14.1 Patch available GHSA-7mpr-5m44-h73r
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:matthewwithanm:markdownify:*:*:*:*:*:python:*:* | before 0.14.1 | Vulnerable | Matthewwithanm |
- cpe:2.3:a:matthewwithanm:markdownify:*:*:*:*:*:python:*:* Versions before 0.14.1 Vulnerable ·Matthewwithanm
Remediation
- Fix · CNA python-markdownify (python-markdownify) Fixed in 0.14.1
- Fix · GHSA-7mpr-5m44-h73r markdownify (PyPI) Fixed in 0.14.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-46656
- 2026-10-03 Alias added: GHSA-7mpr-5m44-h73r
References
Sources
- CVE-2025-46656 · CVE Program
- CVE-2025-46656 · NVD
- FIRST EPSS
- GHSA-7mpr-5m44-h73r · 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