Description
The function number_format is vulnerable to a heap overflow issue when its second argument ($dec_points) is excessively large. The internal implementation of the function will cause a string to be created with an invalid length, which can then interact poorly with other functions. This affects all supported versions of HHVM (3.30.1 and 3.27.5 and below).
References (2)
Core 2
Core References
Patch, Third Party Advisory x_refsource_misc
https://github.com/facebook/hhvm/commit/190ffdf6c8b1ec443be202c7d69e63a7e3da25e3
Release Notes, Vendor Advisory x_refsource_misc
https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.html
Scores
CVSS v3
9.8
EPSS
0.0092
EPSS Percentile
76.1%
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-122
CWE-787
Status
published
Products (1)
facebook/hhvm
< 3.27.5
Published
Jan 15, 2019
Tracked Since
Feb 18, 2026