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CVE-2023-28631

5.3 · MEDIUM

comrak is a CommonMark + GFM compatible Markdown parser and renderer written in rust.

Published Mar 28, 2023CWE-755EPSS 1.27%

Overview

CVE-2023-28631 is a medium-severity vulnerability. It was published on March 28, 2023 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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<u8>` fields in the AST. This issue is also tracked as `GHSL-2023-049`.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/kivikakk/comrak/commit/9ff5f8df0ac951f5742d22a72c39b89a15f56639GitHubgithub.com/kivikakk/comrak/security/advisories/GHSA-5r3x-p7xx-x6q5Reflists.fedoraproject.org/archives/list/[email protected]/message/OUYME2VA555X6567H7ORIJQFN4BVGT6N/Reflists.fedoraproject.org/archives/list/[email protected]/message/PTWZWCT7KCX2KTXTLPUYZ3EHOONG4X46/Reflists.fedoraproject.org/archives/list/[email protected]/message/VQ3UBC7LE4VPCMZBTADIBL353CH7CPVV/GitHubgithub.com/kivikakk/comrak/commit/9ff5f8df0ac951f5742d22a72c39b89a15f56639GitHubgithub.com/kivikakk/comrak/security/advisories/GHSA-5r3x-p7xx-x6q5Reflists.fedoraproject.org/archives/list/[email protected]/message/OUYME2VA555X6567H7ORIJQFN4BVGT6N/Reflists.fedoraproject.org/archives/list/[email protected]/message/PTWZWCT7KCX2KTXTLPUYZ3EHOONG4X46/Reflists.fedoraproject.org/archives/list/[email protected]/message/VQ3UBC7LE4VPCMZBTADIBL353CH7CPVV/

How CyberStrike helps

Frequently asked questions

What is CVE-2023-28631?

CVE-2023-28631 is a medium-severity vulnerability. It was published on March 28, 2023 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2023-28631?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-28631?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-28631?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-28631 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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