CVE-2026-25598: Stepsecurity Harden-Runner

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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 connections to evade audit logging. Specifically, outbound traffic using the sendto, sendmsg, and sendmmsg socket system calls can bypass detection and logging when using egress-policy: audit. This vulnerability is fixed in 2.14.2.

Affected products

• Stepsecurity Harden-Runner: before 2.14.2 (fixed in 2.14.2)

Published 2026-02-09. Last modified 2026-06-17.