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Vulnerability record · CVE-2016-1000005 · published 19 February 2020

CVE-2016-1000005: Facebook hhvm type confusion vulnerability

Facebook · Hhvm

mcrypt_get_block_size did not enforce that the provided "module" parameter was a string, leading to type confusion if other types of data were passed in. This issue affects HHVM versions prior to 3.9.5, all versions between 3.10.0 and 3.12.3 (inclusive), and all versions between 3.13.0 and 3.14.1 (inclusive).

9.8 CVSS 3.1 Critical EPSS 1.4% · top 28.8% CWE-843 · Type confusion
9.8CVSS 3.1 base score, v2 7.5
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

mcrypt_get_block_size did not enforce that the provided "module" parameter was a string, leading to type confusion if other types of data were passed in. This issue affects HHVM versions prior to 3.9.5, all versions between 3.10.0 and 3.12.3 (inclusive), and all versions between 3.13.0 and 3.14.1 (inclusive).

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.

References

LinkTags
https://github.com/facebook/hhvm/commit/39e7e177473350b3a5c34e8824af3b98e25efa89 PatchThird Party Advisory
https://www.facebook.com/security/advisories/cve-2016-1000005 Third Party Advisory
https://github.com/facebook/hhvm/commit/39e7e177473350b3a5c34e8824af3b98e25efa89 PatchThird Party Advisory
https://www.facebook.com/security/advisories/cve-2016-1000005 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2016-1000005), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.