Insufficient Boundary Checks in JSON Decoding for HHVM by Facebook

CVE-2020-1893

What is CVE-2020-1893?

The vulnerability involves inadequate boundary checks during JSON decoding, particularly in the TryParse function, which may lead to the potential reading of out-of-bounds memory. This behavior increases the risk of Denial of Service (DoS) attacks. Multiple versions of HHVM are affected, specifically those from versions 4.41.0 down to certain earlier versions. Remediation is essential to protect systems from the vulnerabilities associated with improper memory handling.

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