How severe is CVE-2026-32946?

CVE-2026-32946 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-32946 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-32946?

CVE-2026-32946 affects Stepsecurity Harden-runner. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-32946?

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

Does CVE-2026-32946 have an EU (EUVD) identifier?

Yes. CVE-2026-32946 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13517.

When was CVE-2026-32946 published?

CVE-2026-32946 was published on 2026-03-20 and last updated on 2026-06-17.

CVE-2026-32946

CVE-2026-32946 is a low-severity vulnerability in Stepsecurity Harden-runner with a CVSS 3.x base score of 2.7. 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-693.

Key facts

Severity: Low (CVSS 3.x base score 2.7)
CVSS v4: 4.6
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13517
Weakness: CWE-693
Affected product: Stepsecurity Harden-runner
Published: 2026-03-20
Last modified: 2026-06-17

Description

Harden-Runner is a CI/CD security agent that works like an EDR for GitHub Actions runners. In versions 2.15.1 and below, the Harden-Runner that allows bypass of the egress-policy: block network restriction using DNS queries over TCP. Egress policies are enforced on GitHub runners by filtering outbound connections at the network layer. When egress-policy: block is enabled with a restrictive allowed-endpoints list (e.g., only github.com:443), all non-compliant traffic should be denied. However, DNS queries over TCP, commonly used for large responses or fallback from UDP, are not adequately restricted. Tools like dig can explicitly initiate TCP-based DNS queries (+tcp flag) without being blocked. This vulnerability requires the attacker to already have code execution capabilities within the GitHub Actions workflow. The issue has been fixed in version 2.16.0.

Frequently asked questions

What is CVE-2026-32946?: Harden-Runner is a CI/CD security agent that works like an EDR for GitHub Actions runners. In versions 2.15.1 and below, the Harden-Runner that allows bypass of the egress-policy: block network restriction using DNS queries over TCP. Egress policies are enforced on GitHub runners by filtering outbound connections at the network layer. When egress-policy: block is enabled with a restrictive allowed-endpoints list (e.g., only github.com:443), all non-compliant traffic should be denied. However, DNS queries over TCP, commonly used for large responses or fallback from UDP, are not adequately restricted. Tools like dig can explicitly initiate TCP-based DNS queries (+tcp flag) without being blocked. This vulnerability requires the attacker to already have code execution capabilities within the GitHub Actions workflow. The issue has been fixed in version 2.16.0.
How severe is CVE-2026-32946?: CVE-2026-32946 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-32946 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-32946?: CVE-2026-32946 affects Stepsecurity Harden-runner. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-32946?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-32946 have an EU (EUVD) identifier?: Yes. CVE-2026-32946 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13517.
When was CVE-2026-32946 published?: CVE-2026-32946 was published on 2026-03-20 and last updated on 2026-06-17.

References

Affected products (1)

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

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