How severe is CVE-2023-37463?

CVE-2023-37463 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.

Is CVE-2023-37463 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-37463?

CVE-2023-37463 affects Github Cmark-gfm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-37463?

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

When was CVE-2023-37463 published?

CVE-2023-37463 was published on 2023-07-13 and last updated on 2026-06-17.

CVE-2023-37463

CVE-2023-37463 is a medium-severity vulnerability in Github Cmark-gfm with a CVSS 3.x base score of 6.4. 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-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.4)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Github Cmark-gfm
Published: 2023-07-13
Last modified: 2026-06-17

Description

cmark-gfm is an extended version of the C reference implementation of CommonMark, a rationalized version of Markdown syntax with a spec. Three polynomial time complexity issues in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. These vulnerabilities have been patched in 0.29.0.gfm.12.

Frequently asked questions

What is CVE-2023-37463?: cmark-gfm is an extended version of the C reference implementation of CommonMark, a rationalized version of Markdown syntax with a spec. Three polynomial time complexity issues in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. These vulnerabilities have been patched in 0.29.0.gfm.12.
How severe is CVE-2023-37463?: CVE-2023-37463 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
Is CVE-2023-37463 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-37463?: CVE-2023-37463 affects Github Cmark-gfm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-37463?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-37463 published?: CVE-2023-37463 was published on 2023-07-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:github:cmark-gfm:*:*:*:*:*:*:*:*

More vulnerabilities in Github Cmark-gfm

CVE-2024-22051 — Critical (CVSS 9.8): CommonMarker versions prior to 0.23.4 are at risk of an integer overflow vulnerability. This vulnerability can result…
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CVE-2023-26485 — Medium (CVSS 5.3): cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. A polynomial time…
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