CVE catalog
CVE-2023-42821
golang-github-gomarkdown-markdown: CVE-2023-42821
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.25% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | golang-github-gomarkdown-markdown | sid | 0.0~git20260725.8435af3-1 | fixed |
| Debian | golang-github-gomarkdown-markdown | forky | 0.0~git20260725.8435af3-1 | fixed |
| Debian | golang-github-gomarkdown-markdown | trixie | 0.0~git20231115.a660076-1 | fixed |
| Debian | golang-github-gomarkdown-markdown | bookworm | 0.0~git20220731.dcdaee8-2 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | golang-github-gomarkdown-markdown | source | sid | 0.0~git20231115.a660076-1 | not yet assigned | Not reported | Not reported |
| Debian | golang-github-gomarkdown-markdown | source | forky | 0.0~git20231115.a660076-1 | not yet assigned | Not reported | Not reported |
| Debian | golang-github-gomarkdown-markdown | source | trixie | 0.0~git20231115.a660076-1 | not yet assigned | Not reported | Not reported |
| Debian | golang-github-gomarkdown-markdown | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
Notes
[bookworm] golang-github-gomarkdown-markdown: Minor issue
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.