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Not in CISA KEV
HIGH severity

Logic error in authentication in proxy.pyGHSA-cmc7-mfmr-xqrx

HIGHFix: abhinavsingh/proxy.py#482

GHSA-cmc7-mfmr-xqrx is a high-severity (CVSS 7.5) CWE-697 vulnerability in proxy-py. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for proxy-py — see the affected versions and patch details below.

Also known asCVE-2021-3116PYSEC-2021-46
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs77th percentile — riskier than 77% of all scored CVEsHighest risk
0.00%0.73%1.46%2.19%0.4%1.7%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍proxy-py

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

before_upstream_connection in AuthPlugin in http/proxy/auth.py in proxy.py before 2.3.1 accepts incorrect Proxy-Authorization header data because of a boolean confusion (and versus or).

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIproxy-pyall versions2.3.1pip install --upgrade 'proxy-py==2.3.1'

Affected Products

1 product · 1 configurations
Application
proxy.pyproxy.py_project
< 2.3.1
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

before_upstream_connection in AuthPlugin in http/proxy/auth.py in proxy.…

cardaci.xyzNVDJan 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for proxy-py, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update proxy-py to 2.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-cmc7-mfmr-xqrx is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

before_upstream_connection in AuthPlugin in http/proxy/auth.py in proxy.py before 2.3.1 accepts incorrect Proxy-Authorization header data because of a boolean confusion (and versus or).
O3 Security · Impact-Aware SCA

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Logic error in authentication in proxy.py (High 7.5)