CVE-2019-11936 json
Various APC functions accept keys containing null bytes as input, leading to premature truncation of input.
published 2019-12-04 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3593
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.5%
- EPSS 1.5% chance of exploitation in 30 days, percentile 74%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
1.48% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Facebook HHVM
Classification
- Weakness
-
- CWE-626 Null Byte Interaction Error (Poison Null Byte)
References
-
github.com
/facebook/hhvm/commit/f57df6d8cf33cb14c40f52287da29360e7003373
patch, third-party-advisory
-
hhvm.com
/blog/2019/10/28/security-update.html
vendor-advisory
-
facebook.com
/security/advisories/cve-2019-11936
vendor-advisory
Sources
- CVE List CVE-2019-11936
- NVD CVE-2019-11936
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