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.

CVSS Scores

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Meta Information

Published

2026-02-09

Last Modified

2026-02-28

Generated

2026-07-06

AI Q&A

2026-02-09

EPSS Evaluated

2026-07-05

NVD

CVE-2026-25598

EUVD

EUVD-2026-6837

Affected Vendors & Products

Vendor	Product	Version / Range
stepsecurity	harden-runner	to 2.14.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

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

I don't know

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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