CVE-2023-42821
Parser out-of-bounds read caused by a malformed markdown input in github.com/gomarkdown/markdown
Description
The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.
How to fix CVE-2023-42821
To remediate CVE-2023-42821, upgrade the affected package to a fixed version below.
- —no fix listed
- —upgrade to 0.0.0-20230922105210-14b16010c2ee or later
- —upgrade to 0.0.0-20230922105210-14b16010c2ee or later
Is CVE-2023-42821 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0
- from 0, < 0.0.0-20230922105210-14b16010c2ee
- from 0, < 0.0.0-20230922105210-14b16010c2ee
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |