Is CVE-2026-25598 in the CISA KEV catalog?

No. CVE-2026-25598 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-25598?

CVE-2026-25598 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2026-25598?

CVE-2026-25598 has an EPSS score of 0.31% (23th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-25598?

Upgrade harden-runner to 2.14.2 or later.

CVE & CISA-KEV Catalog

CVE-2026-25598

MEDIUM

5.3

CVSS v3

NVD

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.

CWE-778

How to fix

Remediation Available

harden-runnerNVD

Affected:< 2.14.2Fixed in:2.14.2CVE-2026-25598derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploit Intelligence

0.31%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Vendor Advisory1

github.com

Release Notes1

github.com

Embed a live status badge for CVE-2026-25598

Markdown

[![CVE-2026-25598](https://tridentstack.com/cve/badge/CVE-2026-25598.svg)](https://tridentstack.com/cve/CVE-2026-25598)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-25598"><img src="https://tridentstack.com/cve/badge/CVE-2026-25598.svg" alt="CVE-2026-25598"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-28.