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🐍 PyPI
Not in CISA KEV
HIGH severity

python-engineio vulnerable to Cross-Site Request Forgery (CSRF)GHSA-j3jp-gvr5-7hwq

HIGH

GHSA-j3jp-gvr5-7hwq is a high-severity (CVSS 8.8) Cross-Site Request Forgery (CSRF) vulnerability in python-engineio. A fix is available for python-engineio — see the affected versions and patch details below.

Also known asCVE-2019-13611PYSEC-2019-170
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs59th percentile — riskier than 59% of all scored CVEsHighest risk
0.00%0.45%0.90%1.35%0.1%0.9%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
🐍python-engineio

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

WebSocket cross-origin vulnerability

Impact

This is a Cross-Site Request Forgery (CSRF) vulnerability. It affects Socket.IO and Engine.IO web servers that authenticate clients using cookies.

Patches

python-engineio version 3.9.0 patches this vulnerability by adding server-side Origin header checks.

Workarounds

Do not use cookies for client authentication, or else add a CSRF token to the connection URL.

References

https://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF) https://www.christian-schneider.net/CrossSiteWebSocketHijacking.html

For more information

If you have any questions or comments about this advisory:

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIpython-engineioall versions3.9.0pip install --upgrade 'python-engineio==3.9.0'

Affected Products

1 product · 1 configurations
Application
python-engineiopython-engineio_project
≤ 3.8.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update python-engineio to 3.9.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-j3jp-gvr5-7hwq 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

## WebSocket cross-origin vulnerability ### Impact This is a Cross-Site Request Forgery (CSRF) vulnerability. It affects Socket.IO and Engine.IO web servers that authenticate clients using cookies. ### Patches python-engineio version 3.9.0 patches this vulnerability by adding server-side Origin header checks. ### Workarounds Do not use cookies for client authentication, or else add a CSRF token to the connection URL. ### References https://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF) https://www.christian-schneider.net/CrossSiteWebSocketHijacking.html ### For more information
O3 Security · Impact-Aware SCA

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python-engineio vulnerable to Cross-Site Request Forgery…