CVE-2025-47935Network attack vector

Service interruption via unclosed request-error streams

Published May 19, 2025 · Updated May 27, 2025

Resource exhaustion in Multer before 2.0.0 allows remote attackers to interrupt Node.js services via failed multipart uploads. The makeMiddleware error path unpipes busboy but fails to drain the request or handle its error, leaving streams, memory, and file descriptors unreleased. Any exposed multipart upload route is reachable without authentication; repeated failed requests accumulate resources until the service requires a manual restart.

CVSS severity7.5
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Multer before 2.0.0 allows remote attackers to interrupt Node.js services via failed multipart uploads. The makeMiddleware error path unpipes busboy but fails to drain the request or handle its error, leaving streams, memory, and file descriptors unreleased. Any exposed multipart upload route is reachable without authentication; repeated failed requests accumulate resources until the service requires a manual restart.

The record

CVE
CVE-2025-47935
Published
May 19, 2025
Updated
May 27, 2025
Vendor
body-parser
Product
Multer
Classifications
CWE-401, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2025CVE publishedPublication date reported by the CVE source.
  2. May 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

body-parser · Multerversion=< 2.0.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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