CVE-2025-46656

LOW

Published Apr 26, 2025 Modified Oct 16, 2025 CWE-1284

Description

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.

CVSS v3.1 Score

2.9

LOW

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness Type (CWE)

CWE-1284 CWE-1284

Affected Products

Vendor	Product	Versions
matthewwithanm	markdownify	< 0.14.1

References

Advisories & Patches

https://github.com/matthewwithanm/python-markdownify/compare/0.14.0...0.14.1

Exploits

https://github.com/matthewwithanm/python-markdownify/issues/143 https://github.com/matthewwithanm/python-markdownify/issues/143

Frequently Asked Questions

What is CVE-2025-46656? +

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. It has a CVSS v3.1 base score of 2.9 (LOW).

How severe is CVE-2025-46656? +

CVE-2025-46656 has a CVSS v3.1 score of 2.9 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-46656? +

CVE-2025-46656 affects products from matthewwithanm, specifically: markdownify. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-46656? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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