CVE-2023-28631: comrak is a CommonMark + GFM compatible Markdown parser and renderer written in rust

Q: How do I fix CVE-2023-28631?

comrak: upgrade to 0.17.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-28631 being exploited?

CVE-2023-28631 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-28631 affect?

CVE-2023-28631 affects comrak. Severity is medium (CVSS 5.3). 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

Q: How urgent is CVE-2023-28631?

Priority 41/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.3REMOTEUPGRADE

CVE-2023-28631 is a medium-severity flaw (CVSS 5.3) affecting comrak. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-755
Published	2023-03-28
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: comrak project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-03-28 21:15 UTCPublished CVE record published
2026-06-17 05:48 UTCUpdated Record last modified

comrak project comrak UPGRADE

Affected: < 0.17.0

Fixed in: 0.17.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy comrak || rpm -q comrak || comrak --version

2. UPGRADE to 0.17.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade comrak

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade comrak

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-28631?

comrak: upgrade to 0.17.0. Exact commands for each OS are on this page.

Is CVE-2023-28631 being exploited?

CVE-2023-28631 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-28631 affect?

CVE-2023-28631 affects comrak. Severity is medium (CVSS 5.3). 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

How urgent is CVE-2023-28631?

Priority 41/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-28626 MEDIUM 5.3 UPGRADE comrak is a CommonMark + GFM compatible Markdown parser and renderer written in rust

References

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