CVE-2020-1888 – Insufficient boundary checks when decoding JSON in handleBackslash reads

Insufficient boundary checks when decoding JSON in handleBackslash reads out of bounds memory, potentially leading to DOS. This issue affects HHVM 4.45.0, 4.44.0, 4.43.0, 4.42.0, 4.41.0, 4.40.0, 4.39.0, versions between 4.33.0 and 4.38.0 (inclusive), versions between 4.9.0 and 4.32.0 (inclusive), and versions prior to 4.8.7.

Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1888

Reference (s):

• https://github.com/facebook/hhvm/commit/b3679121bb3c7017ff04b4c08402ffff5cf59b13
• https://hhvm.com/blog/2020/02/20/security-update.html