{"cve":"CVE-2016-3957","nvd":{"published":"2018-02-06T18:29:00.400","modified":"2026-06-17T00:46:38.307","status":"Modified","description":"The secure_load function in gluon/utils.py in web2py before 2.14.2 uses pickle.loads to deserialize session information stored in cookies, which might allow remote attackers to execute arbitrary code by leveraging knowledge of encryption_key.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-502"],"references":["https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/","https://github.com/web2py/web2py/blob/R-2.14.1/gluon/utils.py#L200","https://usn.ubuntu.com/4030-1/","https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/","https://github.com/web2py/web2py/blob/R-2.14.1/gluon/utils.py#L200"],"products":["web2py:web2py"],"source":"nvd","synced_at":"2026-10-19T20:48:34.567387330+00:00"},"epss":{"cve":"CVE-2016-3957","score":0.04937,"percentile":0.92146,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}