{"schema":"threatline.record/2","record":{"id":"CVE-2026-106448","aliases":["GHSA-w48f-fwg7-ww6p"],"summary":"StableLib: Prototype poisoning via `__proto__` map keys in CBOR decoding","details":"StableLib is a stable library of useful TypeScript and JavaScript code. Prior to 2.0.4, the @stablelib/cbor CBOR map decoding path creates ordinary JavaScript objects and assigns attacker-controlled keys with bracket assignment. A map key named __proto__ invokes the inherited prototype setter instead of creating an ordinary own property, allowing the decoded object's prototype to contain attacker-controlled authorization or feature-flag values. Downstream code that trusts normal property lookup or merges the decoded object can therefore make security-sensitive decisions using inherited attacker data. This issue is fixed in version 2.0.4.","categories":["Libraries & packages"],"product":"stablelib","vendor":"StableLib","ecosystem":"npm","affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106448","source_modified_at":"2026-10-07T17:07:38.703Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"stablelib","vendor":"StableLib","versions":[{"version":"< 2.0.4","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-w48f-fwg7-ww6p","source_modified_at":"2026-10-07T10:56:10.181649137Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"@stablelib/cbor","ecosystem":"npm","purl":"pkg:npm/%40stablelib/cbor"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.0.3"}]}],"versions":[]}],"fixed_versions":[{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-w48f-fwg7-ww6p","source_modified_at":"2026-10-07T10:56:10.181649137Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"@stablelib/cbor","ecosystem":"npm","purl":"pkg:npm/%40stablelib/cbor"},"version":"2.0.3"}],"cvss":8.9,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00401,"percentile":0.33208,"score_date":"2026-10-23"},"published_at":"2026-10-06T19:45:02.616Z","modified_at":"2026-10-07T17:07:38.703Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-106448","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-07T17:07:38.703Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-w48f-fwg7-ww6p","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-07T10:56:10.181649137Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-106448","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/StableLib/stablelib/security/advisories/GHSA-w48f-fwg7-ww6p","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/StableLib/stablelib/commit/0f153a63b7552a0e8721f640984113e419015026","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/StableLib/stablelib/releases/tag/@stablelib/cbor@2.0.4","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-07T15:27:16.755969Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-07T17:07:38.703Z","content_hash":"09fb1c0104b39ebf97030164e641292d91c53da0c7545c820a4be35e67d87309"}}