{"id":"GHSA-442j-39wm-28r2","revision":null,"records":[{"revision":"ce12bce86cfe4ebb89fde13382004fc4","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-442j-39wm-28r2","aliases":[],"title":"Handlebars.js has a Property Access Validation Bypass in container.lookup","description":"## Summary\n\nIn `lib/handlebars/runtime.js`, the `container.lookup()` function uses `container.lookupProperty()` as a gate check to enforce prototype-access controls, but then discards the validated result and performs a second, unguarded property access (`depths[i][name]`). This Time-of-Check Time-of-Use (TOCTOU) pattern means the security check and the actual read are decoupled, and the raw access bypasses any sanitization that `lookupProperty` may perform.\n\nOnly relevant when the **compat** compile option is enabled (`{compat: true}`), which activates `depthedLookup` in `lib/handlebars/compiler/javascript-compiler.js`.\n\n## Description\n\nThe vulnerable code in `lib/handlebars/runtime.js` (lines 137–144):\n\n```javascript\nlookup: function (depths, name) {\n  const len = depths.length;\n  for (let i = 0; i < len; i++) {\n    let result = depths[i] && container.lookupProperty(depths[i], name);\n    if (result != null) {\n      return depths[i][name];  // BUG: should be `return result;`\n    }\n  }\n},\n```\n\n`container.lookupProperty()` (lines 119–136) enforces `hasOwnProperty` checks and `resultIsAllowed()` prototype-access controls. However, `container.lookup()` only uses `lookupProperty` as a boolean gate — if the gate passes (`result != null`), it then performs an independent, raw `depths[i][name]` access that circumvents any transformation or wrapped value that `lookupProperty` may have returned.\n\n## Workarounds\n\n- Avoid enabling `{ compat: true }` when rendering templates that include untrusted data.\n- Ensure context data objects are plain JSON (no Proxies, no getter-based accessor properties).","state":0,"publishedAt":"2026-03-29T15:16:37+00:00","modifiedAt":"2026-09-10T03:50:36.8747163+00:00","affected":[{"ecosystem":"npm","name":"handlebars","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"4.0.0"},{"kind":"fixed","version":"4.7.9"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-442j-39wm-28r2","https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2","https://github.com/handlebars-lang/handlebars.js","https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9"],"sourceUrl":"https://github.com/advisories/GHSA-442j-39wm-28r2","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-442j-39wm-28r2","identifiers":["GHSA-442j-39wm-28r2"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-15T11:05:17.2943378+00:00","complete":true,"records":1781,"lastAttemptAt":"2026-11-15T11:05:17.2943378+00:00","lastSuccessAt":"2026-11-15T11:05:17.4673918+00:00","error":null,"lastVerifiedAt":"2026-11-15T11:05:17.4673928+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-7de4d7559a5263003f03d9f70577ab06f92ba4178309f26fce53e22a4a959294-f90179050d1e68c26defb06294e68ca9aad67fa6285a72a309f2510089445b08","complete":true,"records":425787,"lastAttemptAt":"2026-11-15T11:01:58.8542146+00:00","lastSuccessAt":"2026-11-15T11:01:58.8389797+00:00","error":null,"lastVerifiedAt":"2026-11-15T11:01:58.8542146+00:00","snapshotPublishedAt":"2026-11-15T10:28:09+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-f981543109394c8f9b3df5737aa835e7","complete":false,"records":13821,"lastAttemptAt":"2026-11-15T11:15:00.6236179+00:00","lastSuccessAt":"2026-11-15T11:15:00.619+00:00","error":"257 identifier lookups failed; latest failures include AccessDenied (HTTP 403). Other identifiers were checked independently.","lastVerifiedAt":"2026-11-15T11:15:00.619+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13558,"expectedIdentifiers":13874,"failedIdentifiers":257},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-15T11:05:17.2943378+00:00","complete":true,"records":1125,"lastAttemptAt":"2026-11-15T11:05:17.2943378+00:00","lastSuccessAt":"2026-11-15T11:05:17.4693563+00:00","error":null,"lastVerifiedAt":"2026-11-15T11:05:17.4693566+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-d33b5144615b488f88b7a7390696bc39","complete":true,"records":13833,"lastAttemptAt":"2026-11-15T11:05:18.0594066+00:00","lastSuccessAt":"2026-11-15T10:02:36.038+00:00","error":null,"lastVerifiedAt":"2026-11-15T10:02:36.038+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13874,"expectedIdentifiers":13874,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-64eea06dbd27de8464d5dbce1b78cc794cc59e2d901516ae0d3ea76e624cdae0","complete":true,"records":9955,"lastAttemptAt":"2026-11-15T11:05:12.198625+00:00","lastSuccessAt":"2026-11-14T13:57:23.1208135+00:00","error":null,"lastVerifiedAt":"2026-11-15T11:05:12.198625+00:00","snapshotPublishedAt":"2026-11-14T13:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-f4424d7d4861b1af1404bd15abcb83f295dcd003412a9340ca99dc8200aa148a","complete":true,"records":2014,"lastAttemptAt":"2026-11-15T11:01:59.0034935+00:00","lastSuccessAt":"2026-11-13T19:57:08.2864435+00:00","error":null,"lastVerifiedAt":"2026-11-15T11:01:59.0034935+00:00","snapshotPublishedAt":"2026-11-13T19:33:10+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-6086d649bcb454cdf302d7d9275177bda73550e1b6e446b3520e9b6266d3582c","complete":true,"records":3148,"lastAttemptAt":"2026-11-15T11:05:17.2566792+00:00","lastSuccessAt":"2026-11-15T11:05:17.1034234+00:00","error":null,"lastVerifiedAt":"2026-11-15T11:05:17.2566792+00:00","snapshotPublishedAt":"2026-11-15T10:03:04+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-ff18f36f13fcca3a20a3fb9274b59b8872d18869a99071730e1e79b625c8f612","complete":true,"records":232475,"lastAttemptAt":"2026-11-15T11:05:12.0533004+00:00","lastSuccessAt":"2026-11-15T11:05:10.4195883+00:00","error":null,"lastVerifiedAt":"2026-11-15T11:05:12.0533004+00:00","snapshotPublishedAt":"2026-11-15T10:33:06+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}