Description
The implementations of streams for bz2 and php://output improperly implemented their readImpl functions, returning -1 consistently. This behavior caused some stream functions, such as stream_get_line, to trigger an out-of-bounds read when operating on such malformed streams. The implementations were updated to return valid values consistently. This affects all supported versions of HHVM (3.30 and 3.27.4 and below).
References (2)
Core 2
Core References
Vendor Advisory x_refsource_misc
https://hhvm.com/blog/2019/01/14/hhvm-3.30.2.html
Patch, Third Party Advisory x_refsource_misc
https://github.com/facebook/hhvm/commit/6e4dd9ec3f14b48170fc45dc9d13a3261765f994
Scores
CVSS v3
9.8
EPSS
0.0075
EPSS Percentile
73.2%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-125
Status
published
Products (1)
facebook/hhvm
< 3.27.4
Published
Jan 15, 2019
Tracked Since
Feb 18, 2026