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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00023.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
step-security harden-runner affected
Version Status Constraints
< 2.14.2 affected —

No data.

No data.

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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-cpmj-h4f6-r6pq Harden-Runner: Bypassing Logging of Outbound Connections Using sendto, sendmsg, and sendmmsg in Harden-Runner (Community Tier)
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/step-security/harden-runner/releases/tag/v2.14.2 cve-icon cve-icon cve-icon
https://github.com/step-security/harden-runner/security/advisories/GHSA-cpmj-h4f6-r6pq cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-25598 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-25598 cve-icon
History

Thu, 12 Feb 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}

threat_severity

Moderate

Tue, 10 Feb 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 10 Feb 2026 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Step Security
Step Security harden Runner
Vendors & Products Step Security
Step Security harden Runner

Mon, 09 Feb 2026 19:30:00 +0000

Type Values Removed Values Added
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.
Title Bypassing Logging of Outbound Connections Using sendto, sendmsg, and sendmmsg in Harden-Runner (Community Tier)
Weaknesses CWE-778
References
Metrics cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-10T16:00:59.966Z

Reserved: 2026-02-03T01:02:46.717Z

Link: CVE-2026-25598

cve-icon Vulnrichment

Updated: 2026-02-10T15:30:24.585Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-09T20:15:58.653

Modified: 2026-02-09T21:55:30.093

Link: CVE-2026-25598

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-02-09T18:58:57Z

Links: CVE-2026-25598 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-02-10T16:26:52Z

Weaknesses