GitHub Advisoryadvisory · GitHub Actions
GHSA-65rg-554r-9j5x lychee link checking action affected by arbitrary code injection in composite action
MEDIUM
Official page ↗
- Aliases
- CVE-2024-48908
- Ecosystem
- GitHub Actions
- Packages
- lycheeverse/lychee-action
- Severity
- Moderate
- CVSS vector
- CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
- Weaknesses
- CWE-94
- Reviewed
- 2025-08-28
Affected packages
• GitHub Actions lycheeverse/lychee-action: < 2.0.2 → fixed in 2.0.2
Description
Summary
There is a potential attack of arbitrary code injection vulnerability in `lychee-setup` of the composite action at *action.yml*.
Details
The GitHub Action variable `inputs.lycheeVersion` can be used to execute arbitrary code in the context of the action.
PoC
```yaml
• uses: lycheeverse/lychee@v2
with:
lycheeVersion: $(printenv >> $GITHUB_STEP_SUMMARY && echo "v0.16.1")
```
The previous example will just print all the environment variables to the summary of the workflow, but an attacker could potentially use this vector to compromise the security of the target repository, even passing unnotice because the action will run normally.
Impact
Low
Related
Alias · CVE (1)
- CVE-2024-48908 lychee link checking action checks links in Markdown, HTML, and text files using lychee. vulnerability
Weakness · CWE (1)
- CWE-94 Improper Control of Generation of Code weakness