CVE-2018-6333

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-12-31 · updated 2026-06-17
Weakness: CWE-79

Description

The hhvm-attach deep link handler in Nuclide did not properly sanitize the provided hostname parameter when rendering. As a result, a malicious URL could be used to render HTML and other content inside of the editor's context, which could potentially be chained to lead to code execution. This issue affected Nuclide prior to v0.290.0.

Affected products

Facebook Nuclide: before 0.290.0 — fixed in 0.290.0

How to fix

Upgrade to a fixed version: Facebook Nuclide 0.290.0. Check the vendor advisory for mitigations.

References

https://github.com/facebook/nuclide/commit/65f6bbd683404be1bb569b8d1be84b5d4c74a324
https://github.com/facebook/nuclide/commit/65f6bbd683404be1bb569b8d1be84b5d4c74a324

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