CVE-2026-93604

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{"bugzilla": {"description": "vm2: vm2: Sandbox escape via `crypto.setFips()` function", "id": "2538616", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538616"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.2", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-1100", "details": ["vm2 through 3.12.0 exposes Node.js's crypto.setFips() function to untrusted guest code when an embedder explicitly allowlists the crypto builtin for a NodeVM (require.builtin: ['crypto']). The builtin sanitizer (sanitizeCryptoModule in lib/builtin.js) replaces crypto.setEngine but leaves crypto.setFips callable, and the readonly wrapper used to expose the host module does not localize side effects of forwarded host functions. Guest code can therefore call crypto.setFips() to change the FIPS mode of the entire host process; the modified mode is subsequently observed by trusted host code (crypto.getFips() changed from 0 to 1 in the reported test), crossing the NodeVM isolation boundary. Fixed in vm2 3.12.1.", "A flaw was found in vm2. Untrusted guest code can exploit this vulnerability when the `crypto` builtin is explicitly allowlisted for a NodeVM (Node.js Virtual Machine). By calling the `crypto.setFips()` function, an attacker can modify the FIPS (Federal Information Processing Standards) mode of the entire host process. This allows guest code to bypass the NodeVM isolation boundary, leading to a sandbox escape and potentially impacting the integrity of the host system."], "mitigation": {"lang": "en:us", "value": "This issue is fixed in vm2 version 3.12.1. Red Hat will provide updated versions of Developer Hub and Ansible Portal that include the fixed library version.\nUntil updates are available, administrators can reduce the risk of sandbox escape attacks by implementing the following mitigations:\n1. Review vm2 sandbox configurations to determine if the 'crypto' builtin is explicitly allowlisted for untrusted guest code (require.builtin: ['crypto']). If crypto access is not required for guest code functionality, remove it from the allowlist.\n2. Restrict the sources from which untrusted code is accepted. Only allow code execution from authenticated, trusted users or verified sources. Implement code review processes for any scripts or plugins before they are executed in vm2 sandboxes.\n3. Monitor for unexpected changes to the Node.js process FIPS mode. Log calls to crypto.getFips() before and after guest code execution to detect unauthorized FIPS mode modifications. \n4. In FIPS-required environments, consider running vm2 sandboxes in separate isolated processes rather than in the same process as critical application components. Process-level isolation provides an additional security boundary beyond vm2's VM isolation.\n5. Implement additional access controls and audit logging for any systems that accept and execute user-provided code, scripts, or plugins.\n6. Upgrade to vm2 3.12.1 or later as soon as updated packages are available from Red Hat."}, "name": "CVE-2026-93604", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Affected", "package_name": "rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Affected", "package_name": "rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Affected", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Affected", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Affected", "package_name": "ansible-automation-platform/bootc-automation-portal-rhel9", "product_name": "Self-service automation portal 2"}], "public_date": "2026-09-18T13:20:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93604\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93604\nhttps://github.com/patriksimek/vm2/security/advisories/GHSA-x3v6-43hc-82mc\nhttps://www.vulncheck.com/advisories/vm2-3.11.8-sandbox-escape-via-crypto-setfips"], "statement": "A sandbox escape vulnerability was found in vm2, a Node.js library for running untrusted code in isolated sandboxes. In versions through 3.12.0, vm2 exposes Node.js's crypto.setFips() function to untrusted guest code when an embedder explicitly allowlists the crypto builtin for a NodeVM (by setting require.builtin: ['crypto']). The builtin sanitizer in lib/builtin.js replaces crypto.setEngine() but leaves crypto.setFips() callable, and the readonly wrapper used to expose the host module does not localize side effects of forwarded host functions. As a result, guest code can call crypto.setFips() to change the FIPS mode of the entire host process, crossing the NodeVM isolation boundary.\nThe modified FIPS mode is subsequently observed by trusted host code, violating vm2's fundamental security guarantee of isolating untrusted guest code from the host process. This issue affects Red Hat Developer Hub and Ansible Portal, which use vm2 for sandboxed code execution.", "threat_severity": "Important"}

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