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{"bugzilla": {"description": "vm2: vm2: Information disclosure via zlib shared buffer pool", "id": "2542016", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2542016"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N", "status": "draft"}, "cwe": "CWE-653", "details": ["vm2 before 3.12.2 does not apply its Buffer backing-store ownership invariant (byteOffset === 0 and buffer.byteLength === length) to Buffers returned from host builtin modules. When an application explicitly exposes Node's zlib module through NodeVM's builtin allowlist (require: { builtin: ['zlib'] }), zlib.deflateSync can return a Buffer backed by Node's shared small-buffer pool whose .buffer is the entire pool. Untrusted guest code can construct a full-width view of that ArrayBuffer (Buffer.from(result.buffer, 0, result.buffer.byteLength)) to read and modify bytes belonging to unrelated host buffers, disclosing and corrupting host-realm memory across the sandbox boundary.", "A flaw was found in vm2. When an application permits the sandbox to access built-in Node.js modules such as the zlib compression library, returned data buffers fail to maintain memory isolation from the host system. An attacker executing untrusted code within the sandbox can inspect and alter the underlying shared memory pool, resulting in sensitive information disclosure and memory corruption across the sandbox boundary."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-100723", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Not affected", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Not affected", "package_name": "ansible-automation-platform/bootc-automation-portal-rhel9", "product_name": "Self-service automation portal 2"}], "public_date": "2026-09-27T01:28:30Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-100723\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-100723\nhttps://github.com/patriksimek/vm2/commit/4f2508abeb252aa86eb6761c78b3b000248fb089\nhttps://github.com/patriksimek/vm2/commit/5214b02ef13b82497fcb917b45320dfd014ffd09\nhttps://github.com/patriksimek/vm2/security/advisories/GHSA-489w-w794-jq94\nhttps://www.vulncheck.com/advisories/vm2-before-3.12.2-memory-disclosure-via-zlib-buffer-pool"], "statement": "This vulnerability is rated as an Important severity because untrusted guest code can break sandbox isolation, allowing the disclosure and modification of host memory space. Exploitation requires an explicit, non-default configuration where the application grants the guest environment access to Node's builtin zlib compression module. Red Hat products shipping this library do not expose the vulnerable feature in their active execution paths, which prevents exposure under default configurations.", "threat_severity": "Important"}