CVE-2026-25598
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Audit Logging Bypass in Harden-Runner GitHub Action via Socket Calls

Publication date: 2026-02-09

Last updated on: 2026-02-28

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2026-02-09
Last Modified
2026-02-28
Generated
2026-06-16
AI Q&A
2026-02-09
EPSS Evaluated
2026-06-15
NVD
CVE-2026-25598
EUVD
EUVD-2026-6837
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
stepsecurity harden-runner to 2.14.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-778 When a security-critical event occurs, the product either does not record the event or omits important details about the event when logging it.
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Executive Summary

This vulnerability exists in the Harden-Runner GitHub Action (Community Tier) prior to version 2.14.2. It allows outbound network connections to bypass audit logging. Specifically, when using the egress-policy set to audit, outbound traffic that uses the sendto, sendmsg, and sendmmsg socket system calls can evade detection and logging.

Impact Analysis

The vulnerability can impact you by allowing certain outbound network connections to go undetected and unlogged. This means that potentially malicious or unauthorized network traffic could occur without being recorded, reducing the effectiveness of security monitoring and incident response.

Compliance Impact

I don't know

Detection Guidance

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Mitigation Strategies

The vulnerability is fixed in Harden-Runner version 2.14.2. Immediate mitigation should include upgrading the Harden-Runner GitHub Action (Community Tier) to version 2.14.2 or later to ensure that outbound network connections using sendto, sendmsg, and sendmmsg socket system calls are properly audited and logged.

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