Vulnerability record · CVE-2019-11930 · published 4 December 2019

CVE-2019-11930: Facebook hhvm vulnerability

Facebook · Hhvm

An invalid free in mb_detect_order can cause the application to crash or potentially result in remote code execution. This issue affects HHVM versions prior to 3.30.12, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.23.1, as well as 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, and 4.28.1.

9.8 CVSS 3.1 Critical EPSS 3.2% · top 12.2% CWE-763 · CWE-763

9.8CVSS 3.1 base score, v2 7.5

3.2%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

6References

17 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Hhvm Facebook

References

Link	Tags
https://github.com/facebook/hhvm/commit/524d2e60cfe910406ec6109e4286d7edd545ab36	Patch
https://hhvm.com/blog/2019/10/28/security-update.html	Vendor Advisory
https://www.facebook.com/security/advisories/cve-2019-11930	Vendor Advisory
https://github.com/facebook/hhvm/commit/524d2e60cfe910406ec6109e4286d7edd545ab36	Patch
https://hhvm.com/blog/2019/10/28/security-update.html	Vendor Advisory
https://www.facebook.com/security/advisories/cve-2019-11930	Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-11930), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.