CVE-2014-6229: Facebook Hiphop Virtual Machine

Medium severity, CVSS 5.0. EPSS: 1.7% chance of exploitation in the next 30 days.

The HashContext class in hphp/runtime/ext/ext_hash.cpp in Facebook HipHop Virtual Machine (HHVM) before 3.3.0 incorrectly expects that a certain key string uses '\0' for termination, which allows remote attackers to obtain sensitive information by leveraging read access beyond the end of the string, and makes it easier for remote attackers to defeat cryptographic protection mechanisms by leveraging truncation of a string containing an internal '\0' character.

Affected products

• Facebook Hiphop Virtual Machine: up to and including 3.2.0

Published 2014-12-28. Last modified 2026-06-17.