CVE-2020-1898

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.

• https://github.com/facebook/hhvm/commit/1746dfb11fc0048366f34669e74318b8278a684c
  PatchThird Party Advisory
• https://hhvm.com/blog/2020/06/30/security-update.html
  Vendor Advisory
• https://github.com/facebook/hhvm/commit/1746dfb11fc0048366f34669e74318b8278a684c
  PatchThird Party Advisory
• https://hhvm.com/blog/2020/06/30/security-update.html
  Vendor Advisory