EUVD-2026-67928Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable upload route requires no credentials; sole impact is availability via FD exhaustion; no confidentiality or integrity effect.
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
multer is a middleware for handling multipart/form-data in Node.js. In version 2.2.0, when a disk-backed upload is aborted or truncated before the write stream finishes, multer's disk storage engine removes the visible file but does not close the underlying write file descriptor, leaving a deleted but still open descriptor. A remote attacker able to reach an upload route using the built-in disk storage can send repeated aborted or malformed multipart uploads, each one leaking a file descriptor and retaining disk blocks until the process exits, which can exhaust resources and cause a denial of service. The issue is fixed in multer 2.3.0, which closes the destination write stream on abnormal source termination and defers cleanup until the stream has closed. Upgrade to multer 2.3.0 to remediate.
Articles & Coverage 1
AnalysisAI
File descriptor exhaustion in multer 2.2.0's DiskStorage engine allows remote unauthenticated attackers to cause denial of service by repeatedly sending aborted or malformed multipart upload requests. Each aborted request causes multer to delete the visible file entry while leaving the underlying write file descriptor open, retaining disk blocks until process exit. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerable code path is triggered exclusively when multer is configured with its built-in DiskStorage engine - applications using MemoryStorage or a custom storage adapter are not affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately characterizes the worst-case exposure: a publicly reachable upload route with no authentication. … 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 is the vendor-released patch confirmed by both the CVE description and the OpenJS Foundation advisory at https://github.com/expressjs/multer/security/advisories/GHSA-qfvm-cv95-jqjf. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all systems running multer version 2.2.0 and identify which expose file upload endpoints to untrusted users. …
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External POC / Exploit Code
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