How severe is CVE-2026-25598?

CVE-2026-25598 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-25598 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25598?

CVE-2026-25598 affects Stepsecurity Harden-runner. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25598?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-25598 have an EU (EUVD) identifier?

Yes. CVE-2026-25598 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6837.

When was CVE-2026-25598 published?

CVE-2026-25598 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2026-25598

CVE-2026-25598 is a medium-severity vulnerability in Stepsecurity Harden-runner with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-778.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.3
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6837
Weakness: CWE-778
Affected product: Stepsecurity Harden-runner
Published: 2026-02-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-25598?: 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.
How severe is CVE-2026-25598?: CVE-2026-25598 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-25598 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25598?: CVE-2026-25598 affects Stepsecurity Harden-runner. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25598?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25598 have an EU (EUVD) identifier?: Yes. CVE-2026-25598 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6837.
When was CVE-2026-25598 published?: CVE-2026-25598 was published on 2026-02-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:stepsecurity:harden-runner:*:*:*:*:community:*:*:*

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