{"id":"CVE-2026-27837","summary":"Dottie vulnerable to prototype pollution bypass via non-first path segments in set() and transform()","details":"Dottie provides nested object access and manipulation in JavaScript. Versions 2.0.4 through 2.0.6 contain an incomplete fix for CVE-2023-26132. The prototype pollution guard introduced in commit `7d3aee1` only validates the first segment of a dot-separated path, allowing an attacker to bypass the protection by placing `__proto__` at any position other than the first. Both `dottie.set()` and `dottie.transform()` are affected. Version 2.0.7 contains an updated fix to address the residual vulnerability.","aliases":["GHSA-r5mx-6wc6-7h9w"],"modified":"2026-08-12T03:30:15.544597879Z","published":"2026-02-26T00:19:24.289Z","related":["GHSA-4gxf-g5gf-22h4","GHSA-r5mx-6wc6-7h9w"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-1321"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27837.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27837.json"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-4gxf-g5gf-22h4"},{"type":"ADVISORY","url":"https://github.com/mickhansen/dottie.js/security/advisories/GHSA-r5mx-6wc6-7h9w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27837"},{"type":"FIX","url":"https://github.com/mickhansen/dottie.js/commit/7e8fa1345a4b46325f0eab8d7aeb1c4deaefdb14"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mickhansen/dottie.js","events":[{"introduced":"e0c8baee4e1551b6ce63cc0b5eef18e8362482c2"},{"fixed":"334c32b80ed536522b567ee6a844caf8e5fef9c3"},{"fixed":"7e8fa1345a4b46325f0eab8d7aeb1c4deaefdb14"}],"database_specific":{"extracted_events":[{"introduced":"2.0.4"},{"fixed":"2.0.7"}],"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:dottie_project:dottie:*:*:*:*:*:node.js:*:*"}}],"versions":["v2.0.6","v2.0.4"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-27837.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L"}]}