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.
Published: 2026-02-09
Score: 6.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

No remediation available yet.

Tracking

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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)
History

Sat, 28 Feb 2026 00:30:00 +0000

Type Values Removed Values Added
First Time appeared Stepsecurity
Stepsecurity harden-runner
CPEs cpe:2.3:a:stepsecurity:harden-runner:*:*:*:*:community:*:*:*
Vendors & Products Stepsecurity
Stepsecurity harden-runner
Metrics 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'}

 cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

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'}

Subscriptions

Step Security Harden Runner
Stepsecurity Harden-runner
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 : Analyzed

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

Modified: 2026-02-28T00:23:47.940

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