CVE-2023-28631
Comrak AST node data is not validated (GHSL-2023-049)
Description
### Impact 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. ### Patches 0.17.0 contains adjustments to the AST, storing strings instead of unvalidated byte arrays. ### Workarounds * Validate UTF-8 correctness of all data when assigning to `&[u8]` and `Vec<u8>` fields in the AST. ### References n/a
How to fix CVE-2023-28631
To remediate CVE-2023-28631, upgrade the affected package to a fixed version below.
- —upgrade to 0.17.0 or later
Is CVE-2023-28631 being exploited?
Low — EPSS is 1.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 0.17.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |