How severe is CVE-2023-26303?

CVE-2023-26303 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2023-26303 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26303?

CVE-2023-26303 affects Executablebooks Markdown-it-py. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26303?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-26303 published?

CVE-2023-26303 was published on 2023-02-23 and last updated on 2026-06-17.

CVE-2023-26303

CVE-2023-26303 is a low-severity vulnerability in Executablebooks Markdown-it-py with a CVSS 3.x base score of 3.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-173.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-173
Affected product: Executablebooks Markdown-it-py
Published: 2023-02-23
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-26303?: 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.
How severe is CVE-2023-26303?: CVE-2023-26303 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2023-26303 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26303?: CVE-2023-26303 affects Executablebooks Markdown-it-py. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26303?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-26303 published?: CVE-2023-26303 was published on 2023-02-23 and last updated on 2026-06-17.

References

https://github.com/executablebooks/markdown-it-py/commit/ae03c6107dfa18e648f6fdd1280f5b89092d5d49

Affected products (1)

cpe:2.3:a:executablebooks:markdown-it-py:*:*:*:*:*:*:*:*

More vulnerabilities in Executablebooks Markdown-it-py

CVE-2023-26302 — Low (CVSS 3.3): Denial of service could be caused to the command line interface of markdown-it-py, before v2.2.0, if an attacker was…

All CVEs affecting Executablebooks Markdown-it-py →

Other CWE-173 vulnerabilities

CVE-2023-26302 — Low (CVSS 3.3): Denial of service could be caused to the command line interface of markdown-it-py, before v2.2.0, if an attacker was…

Browse all CWE-173 vulnerabilities →