Critical severity vulnerability that affects event-stream and flatmap-stream
The NPM package flatmap-stream is considered malicious. A malicious actor added this package as a dependency to the NPM event-stream package in version 3.3.6. Users of event-stream are encouraged to downgrade to the last non-malicious version, 3.3.4, or upgrade to the latest 4.x version.
Users of flatmap-stream are encouraged to remove the dependency entirely.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | event-stream | >= 3.3.6, < 4.0.0 | 4.0.0 |
| npm package | flatmap-stream | all versions | no fix |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-506- Platform
- npm
- Package
event-stream, flatmap-stream- Disclosed
- 26.11.2018
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-mh6f-8j2x-4483 - CC BY 4.0
Vulnerability history: flatmap-stream
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 11.2018 09.2020
- Without a fix
- 2
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
Disclosures per year
- 2018: 1
- 2019: 0
- 2020: 1
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
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Critical severity vulnerability that affects event-stream and flatmap-stream this entry
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