{"id":"GHSA-43rv-jrfh-9mrr","summary":"Duplicate Advisory: vm2: NodeVM zlib Buffers expose pooled host memory across the VM boundary","details":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-489w-w794-jq94. This link is maintained to preserve external references.\n\n## Original Description\nvm2 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memory across the sandbox boundary.","modified":"2026-10-05T23:15:03.987381498Z","published":"2026-09-27T03:31:03Z","withdrawn":"2026-10-05T22:59:44Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-10-05T22:59:44Z","nvd_published_at":"2026-09-27T02:17:19Z","cwe_ids":["CWE-200"]},"references":[{"type":"WEB","url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-489w-w794-jq94"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100723"},{"type":"WEB","url":"https://github.com/patriksimek/vm2/commit/4f2508abeb252aa86eb6761c78b3b000248fb089"},{"type":"WEB","url":"https://github.com/patriksimek/vm2/commit/5214b02ef13b82497fcb917b45320dfd014ffd09"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/vm2-before-3.12.2-memory-disclosure-via-zlib-buffer-pool"}],"affected":[{"package":{"name":"vm2","ecosystem":"npm","purl":"pkg:npm/vm2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.12.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-43rv-jrfh-9mrr/GHSA-43rv-jrfh-9mrr.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/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"}]}