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

Q: How do I fix CVE-2023-28626?

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

Q: Is CVE-2023-28626 being exploited?

CVE-2023-28626 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-2023-28626 affect?

CVE-2023-28626 affects comrak. Severity is medium (CVSS 5.3). comrak is a CommonMark + GFM compatible Markdown parser and renderer written in rust. A range of quadratic parsing issues are present in Comrak. These can be used to craft denial-of-service attacks on services that use Comrak to parse Markd

Q: How urgent is CVE-2023-28626?

Priority 40/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.3REMOTEUPGRADE

CVE-2023-28626 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 range of quadratic parsing issues are present in Comrak. These can be used to craft denial-of-service attacks on services that use Comrak to parse Markdown. This issue has been addressed in version 0.17.0. Users are advised to upgrade. There are no known workarounds for this vulnerability. This issue is also tracked as `GHSL-2023-047`

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	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-400
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-2023-28626?

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

Is CVE-2023-28626 being exploited?

CVE-2023-28626 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-2023-28626 affect?

CVE-2023-28626 affects comrak. Severity is medium (CVSS 5.3). comrak is a CommonMark + GFM compatible Markdown parser and renderer written in rust. A range of quadratic parsing issues are present in Comrak. These can be used to craft denial-of-service attacks on services that use Comrak to parse Markd

How urgent is CVE-2023-28626?

Priority 40/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-28631 MEDIUM 5.3 UPGRADE comrak is a CommonMark + GFM compatible Markdown parser and renderer written in rust

References

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