Uncontrolled Recursion Affecting multer package, versions >=1.0.0 <2.2.0>=3.0.0-alpha.1 <3.0.0-alpha.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-MULTER-17342512
- published16 Jun 2026
- disclosed15 Jun 2026
- creditByunSuyoung
Introduced: 15 Jun 2026
NewCVE-2026-5079 (opens in a new tab)How to fix?
Upgrade multer to version 2.2.0, 3.0.0-alpha.2 or higher.
Overview
Affected versions of this package are vulnerable to Uncontrolled Recursion via deeply nested field names in multipart form data. An attacker can exhaust CPU and memory resources by sending a single HTTP request with a crafted multipart body containing excessively nested field names.
Workaround
This vulnerability can be mitigated by setting the limits.fields option 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.