{"schema":"threatline.record/2","record":{"id":"CVE-2026-107353","aliases":["GHSA-rj28-8w7x-jmqc"],"summary":"traverse: set() can write to built-in prototypes via an untrusted path","details":"traverse (npm) versions 0.3.6 through 0.3.9, 0.4.0 through 0.4.6, 0.5.0 through 0.5.2, and 0.6.0 through 0.6.11 allow prototype pollution through set(). When the path passed to set() crosses a primitive value, the next path segment is resolved on that primitive's built-in prototype, so an application that passes an untrusted path to set() lets an attacker add or overwrite properties of String.prototype, Number.prototype, or Boolean.prototype using plain JSON data, for example traverse({ name: 'bob' }).set(['name', '__proto__', 'polluted'], 'yes'). Object.prototype was reachable only with a non-data path segment, such as an object whose toString returns a different value on each call, or through a Proxy that accepts an assignment without storing it. This is fixed in 0.3.10, 0.4.7, 0.5.3, and 0.6.12.","categories":["Unclassified"],"product":"traverse","vendor":"ljharb","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-107353","source_modified_at":"2026-10-07T20:37:09.233Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"traverse","vendor":"ljharb","versions":[{"status":"affected","version":"0.3.6","lessThan":"0.3.10","versionType":"semver"},{"status":"affected","version":"0.4.0","lessThan":"0.4.7","versionType":"semver"},{"status":"affected","version":"0.5.0","lessThan":"0.5.3","versionType":"semver"},{"status":"affected","version":"0.6.0","lessThan":"0.6.12","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-107353","source_modified_at":"2026-10-07T20:37:09.233Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"traverse","ecosystem":null},"version":"0.3.10","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-107353","source_modified_at":"2026-10-07T20:37:09.233Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"traverse","ecosystem":null},"version":"0.4.7","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-107353","source_modified_at":"2026-10-07T20:37:09.233Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"traverse","ecosystem":null},"version":"0.5.3","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-107353","source_modified_at":"2026-10-07T20:37:09.233Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"traverse","ecosystem":null},"version":"0.6.12","basis":"first unaffected version stated in the CVE record"}],"cvss":6.9,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.0028,"percentile":0.19379,"score_date":"2026-10-23"},"published_at":"2026-10-07T19:35:15.351Z","modified_at":"2026-10-07T20:37:09.233Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-107353","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-07T20:37:09.233Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-107353","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/ljharb/js-traverse/security/advisories/GHSA-rj28-8w7x-jmqc","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://github.com/ljharb/js-traverse/commit/81ccab43e379cf42eb2a5f689630f7f79b3d71b8","tags":["patch"]},{"source":"CVE List","url":"https://github.com/ljharb/js-traverse/commit/37a9ebd103d2a259c824c29cdcc3f0dfe1acffce","tags":["patch"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-07T20:36:56.178663Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-07T20:37:09.233Z","content_hash":"e61386609d2f41867089105ef71f7651d5fbd2a6124dfc0806f8f15984cf926b"}}