CVE-2026-25598

Summary

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 Software

Weaknesses

• CWE-778: CWE-778: Insufficient Logging

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/step-security/harden-runner/security/advisories/GHSA-cpmj-h4f6-r6pq
• https://github.com/step-security/harden-runner/releases/tag/v2.14.2

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