# CVE-2019-11936

## Summary

- **CVE ID:** CVE-2019-11936
- **Severity:** UNKNOWN
- **CVSS Score:** 0.03
- **CWE:** CWE-626
- **Published:** Dec 4, 2019
- **Last Modified:** Mar 14, 2026

## Description

Various APC functions accept keys containing null bytes as input, leading to premature truncation of input. This issue affects HHVM versions prior to 3.30.12, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.23.1, as well as 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, and 4.28.1.

## Affected Products

- Facebook — HHVM (4.28.2)
- Facebook — HHVM (4.28.0)
- Facebook — HHVM (4.27.1)
- Facebook — HHVM (4.27.0)
- Facebook — HHVM (4.26.1)
- Facebook — HHVM (4.26.0)
- Facebook — HHVM (4.25.1)
- Facebook — HHVM (4.25.0)
- Facebook — HHVM (4.24.1)
- Facebook — HHVM (4.24.0)
- Facebook — HHVM (4.23.2)
- Facebook — HHVM (4.9.0)
- Facebook — HHVM (4.8.6)
- Facebook — HHVM (4.0.0)
- Facebook — HHVM (3.30.12)
- Facebook — HHVM (unspecified)

## References

- [CNA](https://hhvm.com/blog/2019/10/28/security-update.html)
- [CNA](https://github.com/facebook/hhvm/commit/f57df6d8cf33cb14c40f52287da29360e7003373)
- [CNA](https://www.facebook.com/security/advisories/cve-2019-11936)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.64%
- **EPSS Percentile:** 70.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._