CVE-2020-1898

2021-03-1101:15:14

Google

osv.dev

6.8 Medium

AI Score

Confidence

High

0.003 Low

EPSS

Percentile

70.2%

JSON

The fb_unserialize function did not impose a depth limit for nested deserialization. That meant a maliciously constructed string could cause deserialization to recurse, leading to stack exhaustion. This issue affected HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0.