CVE-2016-3957

CriticalCVSS 9.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.0 9.8/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-502

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/Exploit, Technical Description, Third Party Advisory
https://github.com/web2py/web2py/blob/R-2.14.1/gluon/utils.py#L200Third Party Advisory
https://usn.ubuntu.com/4030-1/
https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/Exploit, Technical Description, Third Party Advisory
https://github.com/web2py/web2py/blob/R-2.14.1/gluon/utils.py#L200Third Party Advisory
https://usn.ubuntu.com/4030-1/

Timeline

Published: Feb 6, 2018
Last modified: Jun 17, 2026
NVD status: Modified

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