GHSA-4r4m-hjwj-43p8
GitHub Security Advisory
Insecure Defaults Allow MITM Over TLS in engine.io-client
✓ GitHub Reviewed
MODERATE
Has CVE
Advisory Details
Affected versions of `engine.io-client` do not verify certificates by default, and as such may be vulnerable to Man-in-the-Middle attacks.
The vulnerability is related to the way that node.js handles the `rejectUnauthorized` setting. If the value is something that evaluates to false, such as undefined or null, certificate verification will be disabled.
## Recommendation
Update to version 1.6.9 or later.
If you are unable to upgrade, ensure all calls to socket.io to have a `rejectedUnauthorized: true` flag.
Affected Packages
npm
engine.io-client
Affected versions:
0
(fixed in 1.6.9)
Related CVEs
Key Information
5.0
/10
Dataset
Last updated: July 5, 2025 6:26 AM
Data from GitHub Advisory Database. This information is provided for research and educational purposes.