CVE-2018-6334

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Multipart-file uploads call variables to be improperly registered in the global scope. In cases where variables are not declared explicitly before being used this can lead to unexpected behavior. This affects all supported versions of HHVM prior to the patch (3.25.1, 3.24.5, and 3.21.9 and below).

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-621 CWE-20

Affected software

Vendor	Product	Versions
Facebook	HHVM	3.25.2; 3.25.0; 3.24.6; 3.22.0; 3.21.10; >= unspecified, < 3.21.10

References

https://github.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cffPatch, Third Party Advisory
https://hhvm.com/blog/2018/03/30/hhvm-3.25.2.htmlPatch, Third Party Advisory
https://github.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cffPatch, Third Party Advisory
https://hhvm.com/blog/2018/03/30/hhvm-3.25.2.htmlPatch, Third Party Advisory

Timeline

Published: Dec 31, 2018
Last modified: Jun 17, 2026
NVD status: Modified

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