CVE-2026-5079 (GCVE-0-2026-5079)
Vulnerability from cvelistv5 – Published: 2026-06-15 13:56 – Updated: 2026-06-15 16:00
VLAI
EPSS
VEX
Title
multer vulnerable to Denial of Service via deeply nested field names
Summary
Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.
Patches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires.
Workarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-15 16:00 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
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