EUVD-2026-67932Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Remote unauthenticated single-request DoS with no complexity barrier; impact is purely availability with 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. A small multipart request with two specially crafted text field names can make multer's field parser synchronously iterate a maximum-length sparse array, blocking the event loop so the process cannot handle other requests. A large numeric array index in the first field allocates a maximum-length sparse array, and a second field with a non-numeric key then triggers a full-length iteration inside the append-field dependency. All versions before 2.3.0 are affected, and this is a remotely triggerable denial of service. multer 2.3.0 adds an opt-in fieldArrayIndexLimit option that rejects oversized array indexes. Upgrade to multer 2.3.0 and set limits.fieldArrayIndexLimit to the largest array index your application needs to remediate.
Articles & Coverage 1
AnalysisAI
Event loop exhaustion in multer (all versions before 2.3.0) allows unauthenticated remote attackers to render a Node.js server completely unresponsive using a single small multipart/form-data request. Two specially crafted field names - a large numeric array index followed by a non-numeric key - cause multer's underlying append-field dependency to synchronously iterate a maximum-length sparse array, permanently blocking the event loop and preventing the process from handling any further requests. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special configuration or non-default deployment mode is required beyond the target application running an unpatched version of multer (any version before 2.3.0) with at least one HTTP endpoint where multer middleware is active. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 score and vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H are well-calibrated to this vulnerability - network-accessible, low complexity, no privileges or user interaction required, and high availability impact. … 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 to multer 2.3.0, the vendor-released patch for this vulnerability, as documented in GitHub Security Advisory GHSA-535w-7cp7-47q4 at https://github.com/expressjs/multer/security/advisories/GHSA-535w-7cp7-47q4. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all Node.js applications and microservices using multer in production and development environments, verify their current versions, and enable security alerts for multer advisories. …
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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