What is CVE-2016-1000006?

CVE-2016-1000006 is a critical-severity vulnerability in Facebook Hhvm, classified under Use After Free. CVSS score: 9.8/10. Published 2019-11-19.

How severe is CVE-2016-1000006?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Use After Free in Facebook Hhvm

CVE-2016-1000006

hhvm before 3.12.11 has a use-after-free in the serialize_memoize_param() and ResourceBundle::__construct() functions.

Vulnerability class: Use-After-Free

Published 2019-11-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.9th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Facebook Hhvm

Weakness classification (CWE)

CWE-416 — Use After Free

References

security-tracker.debian.org/tracker/CVE-2016-1000006 (Third Party Advisory)
www.mail-archive.com/debian-devel-changes@lists.debian.org/msg506329.html
people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1000006.html (Third Party Advisory)

Frequently asked questions

What is CVE-2016-1000006?: CVE-2016-1000006 is a critical-severity vulnerability in Facebook Hhvm, classified under Use After Free. CVSS score: 9.8/10. Published 2019-11-19.
How severe is CVE-2016-1000006?: Critical severity. CVSS v3 base score is 9.8 out of 10.