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.

• CWE-693
• CWE-863

• https://github.com/step-security/harden-runner/releases/tag/v2.16.0Product, Release Notes
• https://github.com/step-security/harden-runner/security/advisories/GHSA-g699-3x6g-wm3gVendor Advisory

Published

Mar 20, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• Uncovering a hidden BOLA in Appsmith's snapshot logicStrix autonomously discovered a BOLA/IDOR vulnerability in Appsmith's snapshot deletion path.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-32940SiYuan is a personal knowledge management system. In version…6.1
• CVE-2026-32941Sliver is a command and control framework that uses a custom…6.5
• CVE-2026-32942PJSIP is a free and open source multimedia communication lib…8.1
• CVE-2026-32943Parse Server is an open source backend that can be deployed …3.1
• CVE-2026-32944Parse Server is an open source backend that can be deployed …7.5
• CVE-2026-32945PJSIP is a free and open source multimedia communication lib…9.8
• CVE-2026-32947Harden-Runner is a CI/CD security agent that works like an E…4.9
• CVE-2026-32948sbt is a build tool for Scala, Java, and others. From versio…7.8
• CVE-2026-32949SQLBot is an intelligent data query system based on a large …7.5
• CVE-2026-32950SQLBot is an intelligent data query system based on a large …8.8
• CVE-2026-32951Discourse is an open-source discussion platform. From versio…4.3
• CVE-2026-32952go-ntlmssp is a Go package that provides NTLM/Negotiate auth…7.5