CVE-2026-5079
- Source
- https://cve.org/CVERecord?id=CVE-2026-5079
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5079.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-5079
- Aliases
- Downstream
- Published
- 2026-06-15T13:56:45.520Z
- Modified
- 2026-07-16T03:46:07.619177884Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- multer vulnerable to Denial of Service via deeply nested field names
- Details
-
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.
- Database specific
{ "cna_assigner": "openjs", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5079.json", "cwe_ids": [ "CWE-400" ] }- References