Tóm tắt nhanh
- CVE-2026-5079 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng multer (expressjs), multer.
- Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.28%, cao hơn 20.4% các lỗ hổng khác.
- Cách xử lý: cập nhật lên 2.2.0, 3.0.0-alpha.2 hoặc mới hơn.
| Gói / sản phẩm | Phiên bản bị ảnh hưởng | Phiên bản đã vá |
|---|
| multer | = 3.0.0≥ 1.0.0, < 2.2.0
| 2.2.0
|
| multer npm | ≥ 1.0.0, < 2.2.0≥ 3.0.0-alpha.1, < 3.0.0-alpha.2
| 2.2.03.0.0-alpha.2
|
Mô tả
Impact
Multer is vulnerable to a Denial of Service (DoS) via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names (e.g., a[b][c]) 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 2.2.0 and configure limits.fieldNestingDepth 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.
Mô tả của NVD
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.
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