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.
References (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://hhvm.com/blog/2020/06/30/security-update.html
Patch, Third Party Advisory x_refsource_misc
https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3
Scores
CVSS v3
9.8
EPSS
0.0081
EPSS Percentile
74.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-416
Status
published
Products (8)
facebook/hhvm
4.57.0
facebook/hhvm
4.58.0
facebook/hhvm
4.58.1
facebook/hhvm
4.59.0
facebook/hhvm
4.60.0
facebook/hhvm
4.61.0
facebook/hhvm
4.62.0
facebook/hhvm
< 4.32.3
Published
Mar 11, 2021
Tracked Since
Feb 18, 2026