{"id":"CVE-2026-33993","revision":"c46a3055fd54424598f35d88ccf76c2d","records":[{"revision":"c46a3055fd54424598f35d88ccf76c2d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-33993","aliases":[],"title":"Locutus has Prototype Pollution via __proto__ Key Injection in unserialize()","description":"Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version 3.0.25, the `unserialize()` function in `locutus/php/var/unserialize` assigns deserialized keys to plain objects via bracket notation without filtering the `__proto__` key. When a PHP serialized payload contains `__proto__` as an array or object key, JavaScript's `__proto__` setter is invoked, replacing the deserialized object's prototype with attacker-controlled content. This enables property injection, for...in propagation of injected properties, and denial of service via built-in method override. This is distinct from the previously reported prototype pollution in `parse_str` (GHSA-f98m-q3hr-p5wq, GHSA-rxrv-835q-v5mh) — `unserialize` is a different function with no mitigation applied. Version 3.0.25 patches the issue.","state":0,"publishedAt":"2026-03-27T22:14:03.495+00:00","modifiedAt":"2026-03-30T15:45:18.66+00:00","affected":[{"ecosystem":"Vendor product","name":"locutus","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"locutusjs\",\n                    \"product\": \"locutus\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 3.0.25\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/locutusjs/locutus/security/advisories/GHSA-4mph-v827-f877","https://github.com/locutusjs/locutus/pull/597","https://github.com/locutusjs/locutus/commit/345a6211e1e6f939f96a7090bfeff642c9fcf9e4","https://github.com/locutusjs/locutus/releases/tag/v3.0.25"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-33993","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-33993","identifiers":["CVE-2026-33993"]},"retained":false,"historicalAffected":[]}],"coverage":[]}