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CVE-2023-26303

20
FAUCET Score

CVE-2023-26303 is a denial-of-service vulnerability affecting markdown-it-py versions prior to 2.2.0, where specially crafted input can force null assertions. This vulnerability has a CVSS score of 5.5 (Medium), indicating a local attack vector with low complexity, and its successful exploitation could lead to high availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.2.0CPE matchmatch criteria
cpe:2.3:a:executablebooks:markdown-it-py:*:*:*:*:*:*:*:*
>= 0, < v2.2.0CPE match
cpe:2.3:a:executablebooks:markdown-it-py:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.3LOW

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
1.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.22%
Probability of exploitation in next 30 days
EPSS Percentile
13.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0022 is in the 59th percentile among its peer group of 15,938 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 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 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: markdown-it-pyFixed in: 2.2.0
redhatno patchvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-lint
redhatno patchvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: ansible-navigator
redhatno patchvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: python3x-ansible-compat
redhatno patchvia redhat_api
Product: Red Hat Ansible Automation Platform 2Fixed in: python-ansible-compat

Vendor Advisories (2)

redhatCVE-2023-26303Moderate

markdown-it-py: Denial of service by forcing null assertions with specially crafted input

Feb 23, 2023
pipGHSA-vrjv-mxr7-vjf8high

markdown-it-py Denial of Service vulnerability

Feb 23, 2023

References

github.com / executablebooks/markdown-it-py/commit/ae03c6107dfa18e648f6fdd1280f5b89092d5d49
Patch