AUGUST 4, 2026
Live Feed
Return to register
Case File

CVE-2018-6334

CRITICAL · CVSS 9.8 EPSS 1.91% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2018-12-31 · Last synced 2026-08-04

Field Assessment

AI analysis pending.

Exhibit — Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2018-6334
Severity
CRITICAL
CVSS
9.8
EPSS
1.91%

Original Filing — NVD Description

Multipart-file uploads call variables to be improperly registered in the global scope. In cases where variables are not declared explicitly before being used this can lead to unexpected behavior. This affects all supported versions of HHVM prior to the patch (3.25.1, 3.24.5, and 3.21.9 and below).