Vulnerability in Step-security Harden-runner

CVE-2026-25598

Harden-Runner is a CI/CD security agent that works like an EDR for GitHub Actions runners. Prior to 2.14.2, a security vulnerability has been identified in the Harden-Runner GitHub Action (Community Tier) that allows outbound network conne…

EPSS: 0.003 (23.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-25598?
CVE-2026-25598 is a medium-severity vulnerability in Step-security Harden-runner, classified under CWE-778. CVSS score: 5.3/10. Published 2026-02-09.
How severe is CVE-2026-25598?
Medium severity. CVSS v3 base score is 5.3 out of 10.