CVE-2020-1900

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.

Score

CVSS 3.1 9.8 Critical

Status

Modified - cve-assign@fb.com

Published

2021-03-11

Last modified

2024-08-04

Weaknesses

CWE-416

Affected products

• Hhvm (Facebook)

References

• https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3
• https://hhvm.com/blog/2020/06/30/security-update.html