Is CVE-2023-26303 in the CISA KEV catalog?

No. CVE-2023-26303 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-26303?

CVE-2023-26303 has a CVSS v3 base score of 3.3 (LOW).

What is the EPSS score for CVE-2023-26303?

CVE-2023-26303 has an EPSS score of 0.22% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-26303?

Upgrade markdown-it-py on debian 12 to 2.1.0-5 or later.

CVE & CISA-KEV Catalog

CVE-2023-26303

LOW

3.3

CVSS v3

NVD

Description

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.

CWE-173

How to fix

Remediation Available

markdown-it-pyDebian

Fixed in:2.1.0-5CVE-2023-26303

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Patch1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-25.