CVE-2023-28631

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 1.3%, top 33% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

comrak is a CommonMark + GFM compatible Markdown parser and renderer written in rust. A Comrak AST can be constructed manually by a program instead of parsing a Markdown document with parse_document. This AST can then be converted to HTML via html::format_document_with_plugins. However, the HTML formatting code assumes that the AST is well-formed. For example, many AST notes contain [u8] fields which the formatting code assumes is valid UTF-8 data. Several bugs can be triggered if this is not the case. Version 0.17.0 contains adjustments to the AST, storing strings instead of unvalidated byte arrays. Users are advised to upgrade. Users unable to upgrade may manually validate UTF-8 correctness of all data when assigning to &[u8] and Vec fields in the AST. This issue is also tracked as GHSL-2023-049.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
67%
KEV
Not listed

Published

March 28, 2023

Last Modified

November 21, 2024

References (10)

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
comrak—0.17.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 112 total refreshes for this CVE.

  1. 2026-07-27 14:10 UTCEPSS rescore
  2. 2026-07-26 14:52 UTCEPSS rescore
  3. 2026-07-26 14:52 UTCEPSS rescore
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  8. 2026-07-23 02:20 UTCEG score recompute
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  20. 2026-07-16 01:23 UTCOSV refresh
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  1. 2026-07-13 22:28 UTCEPSS rescore
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  22. 2026-06-28 04:54 UTCEPSS rescore
  23. 2026-06-28 01:34 UTCOSV refresh
  24. 2026-06-27 03:07 UTCEPSS rescore
  25. 2026-06-25 13:48 UTCEPSS rescore
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  46. 2026-06-14 23:16 UTCEPSS rescore
  47. 2026-06-13 22:59 UTCEPSS rescore
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  49. 2026-06-12 23:10 UTCEPSS rescore
  50. 2026-06-11 13:59 UTCEPSS rescore
  51. 2026-06-10 22:17 UTCEPSS rescore
  52. 2026-06-10 13:21 UTCEPSS rescore
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  54. 2026-06-10 12:17 UTCOSV refresh
  55. 2026-06-08 14:15 UTCEPSS rescore
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  57. 2026-06-07 15:23 UTCEPSS rescore
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  59. 2026-06-06 13:46 UTCEPSS rescore
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  65. 2026-06-04 13:11 UTCEPSS rescore
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  71. 2026-05-31 22:29 UTCEPSS rescore
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  74. 2026-05-31 00:15 UTCEPSS rescore
  75. 2026-05-31 00:15 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-28631?
CVE-2023-28631 is a medium vulnerability published on March 28, 2023. comrak is a CommonMark + GFM compatible Markdown parser and renderer written in rust. A Comrak AST can be constructed manually by a program instead of parsing a Markdown document with parsedocument. This AST can then be converted to HTML via html::formatdocumentwithplugins. However, the HTML…
When was CVE-2023-28631 disclosed?
CVE-2023-28631 was first published in the National Vulnerability Database on March 28, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-28631 actively exploited?
CVE-2023-28631 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 33.3% of all scored CVEs.
What is the CVSS score of CVE-2023-28631?
CVE-2023-28631 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2023-28631?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-28631, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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