What’s Vulnerable › Vulnerabilities

CVE-2019-11936

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-12-04 · updated 2026-06-17
• Weakness: CWE-626

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: before 3.30.12; from 4.0.0 through 4.8.5; from 4.9.0 through 4.23.1; 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, 4.28.1 — fixed in 3.30.12

How to fix

Upgrade to a fixed version: Facebook HHVM 3.30.12. Check the vendor advisory for mitigations.

References

• https://github.com/facebook/hhvm/commit/f57df6d8cf33cb14c40f52287da29360e7003373
• https://hhvm.com/blog/2019/10/28/security-update.html
• https://www.facebook.com/security/advisories/cve-2019-11936
• https://github.com/facebook/hhvm/commit/f57df6d8cf33cb14c40f52287da29360e7003373
• https://hhvm.com/blog/2019/10/28/security-update.html
• https://www.facebook.com/security/advisories/cve-2019-11936

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