CVE-2026-32946

MEDIUM EPSS 16.5%
Published Mar 20, 20263mo ago · Modified Jun 17, 20262w ago
4.6 CVSS 4.0
Medium
Find Similar
Published Mar 20, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
4.6
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
16.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-693
CWE-863 Incorrect Authorization Authorization

Affected Products 1

VendorProductVersionRange
stepsecurityharden-runner* <2.16.0

References 2

  • github.com https://github.com/step-security/harden-runner/releases/tag/v2.16.0
    ProductRelease Notes
  • github.com https://github.com/step-security/harden-runner/security/advisories/GHSA-g699-3x6g-wm3g
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.