{"items":[{"id":"NVI-00013090","kind":"vulnerability","title":"vm2: NodeVM zlib Buffers expose pooled host memory across the VM boundary","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-489w-w794-jq94","CVE-2026-100723"],"plain_summary":"GitHub lists this reviewed advisory for vm2. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-2207269f6363d4f273d331b40d188ab9"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-05T23:00:47.000Z","value":"10 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5a7f75bb71b07f591a8261fa7e1badbb"},{"kind":"CVSS","as_of":"2026-10-01T19:17:16.563Z","value":"7.5 HIGH (3.1)","meaning":"disclosure@vulncheck.com severity; no combined Null risk score.","source_id":"sr-2207269f6363d4f273d331b40d188ab9"},{"kind":"CVSS","as_of":"2026-10-01T19:17:16.563Z","value":"6.9 MEDIUM (4.0)","meaning":"disclosure@vulncheck.com severity; no combined Null risk score.","source_id":"sr-2207269f6363d4f273d331b40d188ab9"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-5a7f75bb71b07f591a8261fa7e1badbb","url":"https://github.com/advisories/GHSA-489w-w794-jq94","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-489w-w794-jq94","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T01:39:10.636Z"},{"id":"sr-2207269f6363d4f273d331b40d188ab9","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100723","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-100723","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-03T09:57:54.204Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5a7f75bb71b07f591a8261fa7e1badbb"],"technology":"vm2","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen an application explicitly exposes Node's `zlib` module through vm2's `NodeVM` builtin allowlist, an untrusted guest can obtain a pool-backed host `Buffer` from `zlib.deflateSync`, create a full-width view of its backing `ArrayBuffer`, read bytes outside the compressed result, and flip a byte in an unrelated host buffer. The pinned vm2 revision reproduces disclosure and host-memory modification, while a sandbox-local `Buffer` control remains exact-size and non-mutating.\n\n## Technical Details\n\n`NodeVM` accepts `require: { builtin: ['zlib'] }`. The builtin resolver reaches `addDefaultBuiltin` in `lib/builtin.js`, where the host module is exposed through the generic readonly wrapper. `zlib.deflateSync` returns a Node `Buffer`; for a small result, that buffer can use Node's shared pool, whose `.buffer` is the complete pool rather than only the logical result slice. The guest can therefore call `Buffer.from(result.buffer, 0, result.buffer.byteLength)` and inspect or modify pooled bytes outside `result`.\n\nThe relevant isolation invariant is that every `Buffer` crossing into the sandbox owns its complete backing store: `byteOffset === 0` and `buffer.byteLength === length`.","public_affected_ranges":["<= 3.12.1"]}],"null_published_at":"2026-11-03T10:03:31.378Z","source_updated_at":"2026-10-05T23:00:47.000Z","source_disclosed_at":"2026-10-05T23:00:46.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-01T01:39:10.636Z"},{"id":"NVI-00013090","kind":"vulnerability","title":"vm2: NodeVM zlib Buffers expose pooled host memory across the VM boundary","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-489w-w794-jq94","CVE-2026-100723"],"plain_summary":"GitHub lists this reviewed advisory for vm2. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-5a7f75bb71b07f591a8261fa7e1badbb"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-05T23:00:47.000Z","value":"10 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5a7f75bb71b07f591a8261fa7e1badbb"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-5a7f75bb71b07f591a8261fa7e1badbb","url":"https://github.com/advisories/GHSA-489w-w794-jq94","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-489w-w794-jq94","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T01:39:10.636Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5a7f75bb71b07f591a8261fa7e1badbb"],"technology":"vm2","known_exclusions":[],"conditions_summary":"## Summary\n\nWhen an application explicitly exposes Node's `zlib` module through vm2's `NodeVM` builtin allowlist, an untrusted guest can obtain a pool-backed host `Buffer` from `zlib.deflateSync`, create a full-width view of its backing `ArrayBuffer`, read bytes outside the compressed result, and flip a byte in an unrelated host buffer. The pinned vm2 revision reproduces disclosure and host-memory modification, while a sandbox-local `Buffer` control remains exact-size and non-mutating.\n\n## Technical Details\n\n`NodeVM` accepts `require: { builtin: ['zlib'] }`. The builtin resolver reaches `addDefaultBuiltin` in `lib/builtin.js`, where the host module is exposed through the generic readonly wrapper. `zlib.deflateSync` returns a Node `Buffer`; for a small result, that buffer can use Node's shared pool, whose `.buffer` is the complete pool rather than only the logical result slice. The guest can therefore call `Buffer.from(result.buffer, 0, result.buffer.byteLength)` and inspect or modify pooled bytes outside `result`.\n\nThe relevant isolation invariant is that every `Buffer` crossing into the sandbox owns its complete backing store: `byteOffset === 0` and `buffer.byteLength === length`.","public_affected_ranges":["<= 3.12.1"]}],"null_published_at":"2026-11-01T07:29:12.918Z","source_updated_at":"2026-10-05T23:00:47.000Z","source_disclosed_at":"2026-10-05T23:00:46.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-01T01:39:10.636Z"}],"next_cursor":null,"snapshot_revision":"42594"}