EUVD-2026-67929
GHSA-qvfw-j98x-7q72
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
AC:H reflects race condition timing dependency; I:L captures limit-bypass without data exfiltration or resource exhaustion; AV:N because upload endpoint is network-accessible.
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
Lifecycle Timeline
3Blast Radius
ecosystem impact- 3,334 npm packages depend on multer (1,244 direct, 2,112 indirect)
Ecosystem-wide dependent count for version 2.3.0.
DescriptionCVE.org
multer is a middleware for handling multipart/form-data in Node.js. When an application uses an asynchronous fileFilter together with the fileSize limit, a race condition in multer's file stream handling can allow a file that exceeds the configured size limit to bypass the size-limit rejection. All versions before 2.3.0 are affected. The impact is limited because the underlying multipart parser still truncates the stream at the size limit, so this is a bypass of the limit rejection rather than uncontrolled resource consumption. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.
AnalysisAI
Race condition in multer's file stream handling allows uploaded files exceeding the configured fileSize limit to bypass size-limit rejection when an application uses an asynchronous fileFilter in combination with the fileSize limit. All multer versions before 2.3.0 are affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target application to be configured with BOTH an asynchronous fileFilter callback AND a fileSize limit option in the multer middleware configuration - applications using only one of these two settings are not vulnerable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 3.1 scores this at 3.7 (Low) with vector AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade multer to version 2.3.0, which resolves the race condition in file stream handling. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
Leaving vuln.today