CVE-2020-1918

Name of the Vulnerable Software and Affected Versions: HHVM versions prior to 4.56.3 HHVM versions 4.57.0 through 4.80.1 HHVM versions 4.81.0 through 4.93.1 HHVM versions 4.94.0 through 4.98.0

Description: In-memory file operations, such as using fopen on a data URI, did not properly restrict negative seeking, allowing for the reading of memory prior to the in-memory buffer.

Recommendations: For HHVM versions prior to 4.56.3, update to version 4.56.3 or later. For HHVM versions 4.57.0 through 4.80.1, update to version 4.80.2 or later. For HHVM versions 4.81.0 through 4.93.1, update to version 4.93.2 or later. For HHVM versions 4.94.0 through 4.98.0, update to a version later than 4.98.0.