CVE-2019-11930

An invalid free in mb_detect_order can cause the application to crash or potentially result in...

9.8 Critical

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

3.25%Up 1.4 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2019-11930
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-763
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-11930
Weakness: CWE-763
Updated: 2026-11-02

EUVDEUVD-2019-3588 No score

Record: EUVD-2019-3588
Updated: 2026-11-03

GitHub AdvisoriesGHSA-5h4f-x39p-f6v8 9.8

An invalid free in mb_detect_order can cause the application to crash or potentially result in...

Record: GHSA-5h4f-x39p-f6v8
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-763
Updated: 2026-11-02

OSV 9.8

Record: CVE-2019-11930
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-04

OSVUBUNTU-CVE-2019-11930 9.8

Record: UBUNTU-CVE-2019-11930
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

facebook hhvm

Affected packages

Affected packages
Package	Affected	Fixed
`hhvm` Ubuntu:16.04:LTS	All versions, plus listed versions 3.11.0+dfsg-13.11.1+dfsg-13.11.1+dfsg-1ubuntu1	None known
`hhvm` Ubuntu:18.04:LTS	All versions, plus listed versions 3.21.0+dfsg-23.21.0+dfsg-2build13.21.0+dfsg-2build23.21.0+dfsg-2build33.21.0+dfsg-2ubuntu2	None known

History

History
Recorded	Changed	Sources
Nov 4, 2026	facts	OSV
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-11930 is a critical vulnerability (CVSS 9.8) in Facebook Hhvm, published December 4, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.25%, the 88th percentile. No source names a fixed version.