Github
CVE-2026-25598
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
2DescriptionGitHub Advisory
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.
AnalysisAI
Harden-Runner versions prior to 2.14.2 fail to log outbound network connections made through sendto, sendmsg, and sendmmsg socket calls when audit mode is enabled, allowing attackers to exfiltrate data from GitHub Actions runners without detection. This integrity bypass affects users relying on Harden-Runner's egress policy auditing for security monitoring. A patch is available in version 2.14.2 and later.
Technical ContextAI
Affects Harden-Runner. 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.
RemediationAI
Fixed in version 2.14.2.. Restrict network access to the affected service where possible.
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Same weakness CWE-778 – Insufficient Logging
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