CVE-2020-1900

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property array before inserting anything into it. Otherwise the array might resize, invalidating previously stored references. This pre-reservation was not occurring in HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0.

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-416

Affected software

Vendor	Product	Versions
Facebook	HHVM	4.62.0; 4.61.0; 4.60.0; 4.59.0; >= 4.58.0, < unspecified; 4.57.0; >= 4.33.0, < unspecified; >= unspecified, < 4.32.3

References

https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3Patch, Third Party Advisory
https://hhvm.com/blog/2020/06/30/security-update.htmlVendor Advisory
https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3Patch, Third Party Advisory
https://hhvm.com/blog/2020/06/30/security-update.htmlVendor Advisory

Timeline

Published: Mar 11, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2020

CVE-2020-190006.1Cross Site Scripting (XSS) in Simiki v1.6.2.1 and prior allows remote attackers to execute arbitrary code via line 54 of the component 'simi CVE-2020-190019.8Command Injection in Simiki v1.6.2.1 and prior allows remote attackers to execute arbitrary system commands via line 64 of the component 'si CVE-2020-190026.1Cross Site Scripting (XSS) in Mezzanine v4.3.1 allows remote attackers to execute arbitrary code via the 'Description' field of the componen CVE-2020-190035.3An issue in Gate One 1.2.0 allows attackers to bypass to the verification check done by the origins list and connect to Gate One instances u CVE-2020-190055.7zrlog v2.1.0 has a vulnerability with the permission check. If admin account is logged in, other unauthorized users can download the databas CVE-2020-190075.4Halo blog 1.2.0 allows users to submit comments on blog posts via /api/content/posts/comments. The javascript code supplied by the attacker CVE-2020-19015.3Receiving a large text message containing URLs in WhatsApp for iOS prior to v2.20.91.4 could have caused the application to freeze while pro CVE-2020-19027.5A user running a quick search on a highly forwarded message on WhatsApp for Android from v2.20.108 to v2.20.140 or WhatsApp Business for And CVE-2020-190287.5*File Upload vulnerability found in Emlog EmlogCMS v.6.0.0 allows a remote attacker to gain access to sensitive information via the /admin/p CVE-2020-19035.5An issue when unzipping docx, pptx, and xlsx documents in WhatsApp for iOS prior to v2.20.61 and WhatsApp Business for iOS prior to v2.20.61 CVE-2020-190375.3Incorrect Access Control vulnearbility in Halo 0.4.3, which allows a malicious user to bypass encrption to view encrpted articles via cookie CVE-2020-190389.1File Deletion vulnerability in Halo 0.4.3 via delBackup.