{"id":"CVE-2026-54737","aliases":["GHSA-mj3g-7xcc-x4vh"],"url":"https://o3.security/vulnerability/CVE-2026-54737","summary":"@phun-ky/defaults-deep Has a Prototype Pollution issue via Unsafe Recursive Property Merging","details":"@phun-ky/defaults-deep is a library like lodash defaultsDeep with array preservation and no lodash dependency. Prior to 2.0.5, defaultsDeep() recursively merges user-supplied objects without filtering proto, constructor, and prototype, allowing properties to be written to Object.prototype. This issue is fixed in version 2.0.5.","published":"2026-07-31T17:48:42.670Z","modified":"2026-09-12T03:30:48.894331687Z","cvss":{"score":7.3,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},"epss":{"score":0.00262,"percentile":0.1802,"asOf":"2026-09-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@phun-ky/defaults-deep","fixedVersion":"2.0.5"}],"fix":{"url":"https://github.com/phun-ky/defaults-deep/commit/807dba930f8718f9126cad59d949b8fd3539b059","label":"phun-ky/defaults-deep@807dba9"},"references":[{"type":"WEB","url":"https://github.com/phun-ky/defaults-deep/releases/tag/2.0.5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54737.json"},{"type":"ADVISORY","url":"https://github.com/phun-ky/defaults-deep/security/advisories/GHSA-mj3g-7xcc-x4vh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54737"},{"type":"FIX","url":"https://github.com/phun-ky/defaults-deep/commit/807dba930f8718f9126cad59d949b8fd3539b059"},{"type":"FIX","url":"https://github.com/phun-ky/defaults-deep/pull/49"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-12T03:30:48.894331687Z"}}