# CVE-2016-1000110: Python 3.5: The CGIHandler class in Python before 2.7.12 does not protect against the HTTP_PROXY variable name clash…

CVE-2016-1000110 is fixed in Python 3.5 on 1 platform by Python 3.5 3.5.3 (version 3.5.3), released January 17, 2017. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2016-1000110
- Priority: Routine
- CVSS: 6.1
- EPSS: 0.0453
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 27, 2019
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2016-1000110

## Description

The CGIHandler class in Python before 2.7.12 does not protect against the HTTP_PROXY variable name clash in a CGI script, which could allow a remote attacker to redirect HTTP requests.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Python 3.5 | 3.5.3 | [Python 3.5 3.5.3](https://patchblox.com/security/data/fix/windows-app/python.python.3.5-3.5.3.md) | Jan 17, 2017 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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