lychee link checking action affected by arbitrary code injection in composite action

CVE-2024-48908 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

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

- 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

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2025-08-28 14:40:08 UTC
Updated
2025-08-28 15:59:37 UTC
GitHub reviewed
2025-08-28 14:40:08 UTC
NVD published
2025-08-28

EPSS Score

Score Percentile
0.01% 1.84%

CVSS Scores

Base score Version Severity Vector
6.9 4.0 —
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 Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:H)
Exploitation depends on constrained or hard-to-reproduce conditions.
Attack requirements (AT:N)
No additional preconditions are required beyond normal reachability.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:N)
No user interaction is required.
Vulnerable system confidentiality impact (VC:H)
High confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:H)
High integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:N)
No availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N)
No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N)
No integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.
Exploit maturity (threat) (E:U)
Unreported: no public PoC, no reported exploitation, and no known simplification tools.

Identifiers

Type Value
GHSA GHSA-65rg-554r-9j5x ↗
CVE CVE-2024-48908 ↗

CWEs

CWE id Name
CWE-94 Improper Control of Generation of Code ('Code Injection')

Credits

  • mondeja (reporter)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
actions lycheeverse/lychee-action < 2.0.2 2.0.2 —

References

cvelogic Threat Intelligence