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CVE-2025-46656

13
FAUCET Score

CVE-2025-46656 affects python-markdownify (aka markdownify) versions prior to 0.14.1, allowing attackers to trigger excessive memory consumption by injecting large headline prefixes like <h9999999>. This is a low-severity vulnerability with a CVSS score of 3.3, indicating a local attack vector, low attack complexity, and a potential impact of only availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.14.1CPE matchmatch criteria
cpe:2.3:a:matthewwithanm:markdownify:*:*:*:*:*:python:*:*

CVSS Data

CVSS version used by this source: 3.1

2.9LOW

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

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
1.4
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.21%
Probability of exploitation in next 30 days
EPSS Percentile
10.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0021 is in the 47th percentile among its peer group of 1,511 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: markdownifyFixed in: 0.14.1

Vendor Advisories (1)

pipGHSA-7mpr-5m44-h73rlow

markdownify allows large headline prefixes such as <h9999999>, which causes memory consumption

Apr 27, 2025

References

github.com / matthewwithanm/python-markdownify/compare/0.14.0...0.14.1
Patch
github.com / matthewwithanm/python-markdownify/issues/143
Exploit