{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-32946", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-17T00:05:53.284Z", "datePublished": "2026-03-20T03:58:40.557Z", "dateUpdated": "2026-03-20T15:47:42.018Z"}, "containers": {"cna": {"title": "Egress Policy Bypass via DNS over TCP in Harden-Runner (Community Tier)", "problemTypes": [{"descriptions": [{"cweId": "CWE-693", "lang": "en", "description": "CWE-693: Protection Mechanism Failure", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-863", "lang": "en", "description": "CWE-863: Incorrect Authorization", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 4.6, "baseSeverity": "MEDIUM", "vectorString": "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", "version": "4.0"}}], "references": [{"name": "https://github.com/step-security/harden-runner/security/advisories/GHSA-g699-3x6g-wm3g", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/step-security/harden-runner/security/advisories/GHSA-g699-3x6g-wm3g"}, {"name": "https://github.com/step-security/harden-runner/releases/tag/v2.16.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/step-security/harden-runner/releases/tag/v2.16.0"}], "affected": [{"vendor": "step-security", "product": "harden-runner", "versions": [{"version": "< 2.16.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-20T03:58:40.557Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-g699-3x6g-wm3g", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-20T15:47:30.696684Z", "id": "CVE-2026-32946", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-20T15:47:42.018Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:stepsecurity:harden-runner:*:*:*:*:community:*:*:*", "matchCriteriaId": "051DFDC1-078C-478D-84B3-3FAD24CB1FE6", "versionEndExcluding": "2.16.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Harden-Runner es un agente de seguridad de CI/CD que funciona como un EDR para los runners de GitHub Actions. En las versiones 2.15.1 y anteriores, el Harden-Runner permite eludir la restricci\u00f3n de red 'egress-policy: block' utilizando consultas DNS sobre TCP. Las pol\u00edticas de egreso se aplican en los runners de GitHub filtrando las conexiones salientes en la capa de red. Cuando 'egress-policy: block' est\u00e1 habilitado con una lista restrictiva de puntos finales permitidos (por ejemplo, solo github.com:443), todo el tr\u00e1fico no conforme deber\u00eda ser denegado. Sin embargo, las consultas DNS sobre TCP, com\u00fanmente utilizadas para respuestas grandes o como alternativa a UDP, no est\u00e1n restringidas adecuadamente. Herramientas como dig pueden iniciar expl\u00edcitamente consultas DNS basadas en TCP (bandera +tcp) sin ser bloqueadas. Esta vulnerabilidad requiere que el atacante ya tenga capacidades de ejecuci\u00f3n de c\u00f3digo dentro del flujo de trabajo de GitHub Actions. El problema ha sido solucionado en la versi\u00f3n 2.16.0."}], "id": "CVE-2026-32946", "lastModified": "2026-03-24T13:12:38.807", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 2.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 4.6, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-20T04:16:50.107", "references": [{"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/step-security/harden-runner/releases/tag/v2.16.0"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/step-security/harden-runner/security/advisories/GHSA-g699-3x6g-wm3g"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-693"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "step-security/harden-runner: Harden-Runner: Egress policy bypass via DNS over TCP", "id": "2449438", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449438"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-791", "details": ["A flaw was found in Harden-Runner, a security agent for GitHub Actions runners. An attacker with existing code execution capabilities within a GitHub Actions workflow can bypass network egress policies, which are security measures designed to control outbound network connections. This bypass occurs by utilizing DNS queries over TCP, allowing unauthorized network communication despite restrictive egress policies."], "name": "CVE-2026-32946", "package_state": [{"cpe": "cpe:/a:redhat:external_secrets_operator:1", "fix_state": "Fix deferred", "package_name": "external-secrets-operator/bitwarden-sdk-server-rhel9", "product_name": "External Secrets Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:external_secrets_operator:1", "fix_state": "Fix deferred", "package_name": "external-secrets-operator/external-secrets-operator-bundle", "product_name": "External Secrets Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:external_secrets_operator:1", "fix_state": "Fix deferred", "package_name": "external-secrets-operator/external-secrets-operator-rhel9", "product_name": "External Secrets Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:external_secrets_operator:1", "fix_state": "Fix deferred", "package_name": "external-secrets-operator/external-secrets-rhel9", "product_name": "External Secrets Operator for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:gatekeeper:3", "fix_state": "Fix deferred", "package_name": "gatekeeper/gatekeeper-rhel9", "product_name": "Gatekeeper 3"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Out of support scope", "package_name": "multicluster-engine/addon-manager-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Out of support scope", "package_name": "multicluster-engine/placement-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Out of support scope", "package_name": "multicluster-engine/registration-operator-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Out of support scope", "package_name": "multicluster-engine/registration-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Out of support scope", "package_name": "multicluster-engine/work-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:windows_machine_config", "fix_state": "Fix deferred", "package_name": "openshift4-wincw/windows-machine-config-operator-bundle", "product_name": "Red Hat OpenShift for Windows Containers"}, {"cpe": "cpe:/a:redhat:windows_machine_config", "fix_state": "Fix deferred", "package_name": "openshift4-wincw/windows-machine-config-rhel9-operator", "product_name": "Red Hat OpenShift for Windows Containers"}], "public_date": "2026-03-20T03:58:40Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-32946\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-32946\nhttps://github.com/step-security/harden-runner/releases/tag/v2.16.0\nhttps://github.com/step-security/harden-runner/security/advisories/GHSA-g699-3x6g-wm3g"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.16.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "harden-runner", "source": "cna", "vendor": "step-security"}, "product": "harden_runner", "vendor": "step_security"}], "analysis": {"en": {"generated_at": "2026-03-20T05:22:30.427447+00:00", "value": {"mitigation_remediation": ["Upgrade to Harden\u2011Runner version 2.16.0 or later."], "summary": {"action": "Patch", "impact": "Egress Policy Bypass via DNS over TCP"}, "threat_synthesis": {"affected_systems": "The affected product is step-security:harden-runner. Versions 2.15.1 and earlier of Harden\u2011Runner are impacted. These versions are used as a CI/CD security agent that enforces outbound network restrictions on GitHub Actions runners. The vulnerability was addressed in Harden\u2011Runner release 2.16.0.", "description_and_impact": "The vulnerability in Harden-Runner (Community Tier) allows an attacker who has code execution privileges within a GitHub Actions workflow to bypass the egress\u2011policy: block restriction. By issuing DNS queries over TCP\u2014a method normally used for large responses or as a fallback from UDP\u2014the attacker can route traffic to disallowed endpoints that are otherwise blocked by the runner\u2019s network\u2011layer filter. The issue corresponds to CWE\u2011693 (Improper Restriction of Operations within the Boundary) and CWE\u2011863 (Improper Neutralization of Intended Functions). It does not enable arbitrary code execution but can be used to exfiltrate data or reach services that should be unreachable under a strict egress policy.", "risk_and_exploitability": "The CVSS score is 4.6, indicating moderate overall risk. EPSS information is unavailable, and the vulnerability is not listed in CISA\u2019s KEV catalog. Because the attack requires pre\u2011existing code execution inside the workflow, the exploitability is limited to environments where a malicious or compromised workflow can run code. Nonetheless, once code execution is achieved, the attacker can use tools such as dig with the +tcp flag to send DNS queries over TCP that are not properly vetted by the egress policy."}}}}, "created": "2026-03-20T08:52:44.109373+00:00", "updated": "2026-03-20T10:37:25.901094+00:00", "vendors": ["step_security", "step_security$PRODUCT$harden_runner"]}