How severe is CVE-2023-22485?

CVE-2023-22485 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2023-22485 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-22485?

CVE-2023-22485 affects Github Cmark-gfm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-22485?

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

When was CVE-2023-22485 published?

CVE-2023-22485 was published on 2023-01-24 and last updated on 2026-06-17.

CVE-2023-22485

CVE-2023-22485 is a medium-severity vulnerability in Github Cmark-gfm with a CVSS 3.x base score of 5.3. 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-91.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-91
Affected product: Github Cmark-gfm
Published: 2023-01-24
Last modified: 2026-06-17

Description

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior 0.29.0.gfm.7, a crafted markdown document can trigger an out-of-bounds read in the `validate_protocol` function. We believe this bug is harmless in practice, because the out-of-bounds read accesses `malloc` metadata without causing any visible damage.This vulnerability has been patched in 0.29.0.gfm.7.

Frequently asked questions

What is CVE-2023-22485?: cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior 0.29.0.gfm.7, a crafted markdown document can trigger an out-of-bounds read in the `validate_protocol` function. We believe this bug is harmless in practice, because the out-of-bounds read accesses `malloc` metadata without causing any visible damage.This vulnerability has been patched in 0.29.0.gfm.7.
How severe is CVE-2023-22485?: CVE-2023-22485 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2023-22485 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-22485?: CVE-2023-22485 affects Github Cmark-gfm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-22485?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-22485 published?: CVE-2023-22485 was published on 2023-01-24 and last updated on 2026-06-17.

References

https://github.com/github/cmark-gfm/security/advisories/GHSA-c944-cv5f-hpvr

Affected products (1)

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

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