Description
Impact: multer versions 2.0.0-alpha.1 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service when using diskStorage. Aborted or malformed multipart uploads leave orphaned partial files on disk because the Readable.pipe() call does not propagate the stream destroy signal to
the underlying fs.WriteStream. An attacker can exhaust disk space by triggering many aborted uploads, with no application bug required.

Patches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease). Both versions track in-flight write streams and clean them up on the abort path.

Workarounds: None.
Published: 2026-06-15
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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History

Tue, 16 Jun 2026 17:00:00 +0000

Type Values Removed Values Added
First Time appeared Expressjs
Expressjs multer
CPEs cpe:2.3:a:expressjs:multer:*:*:*:*:*:node.js:*:*
cpe:2.3:a:expressjs:multer:3.0.0:alpha1:*:*:*:node.js:*:*
Vendors & Products Expressjs
Expressjs multer

Mon, 15 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 15 Jun 2026 16:00:00 +0000

Type Values Removed Values Added
Description Impact: multer versions 2.0.0-alpha.1 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service when using diskStorage. Aborted or malformed multipart uploads leave orphaned partial files on disk because the Readable.pipe() call does not propagate the stream destroy signal to the underlying fs.WriteStream. An attacker can exhaust disk space by triggering many aborted uploads, with no application bug required. Patches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease). Both versions track in-flight write streams and clean them up on the abort path. Workarounds: None.
Title multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads
Weaknesses CWE-459
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


Subscriptions

Expressjs Multer
cve-icon MITRE

Status: PUBLISHED

Assigner: openjs

Published:

Updated: 2026-06-15T16:07:45.114Z

Reserved: 2026-03-27T16:26:09.638Z

Link: CVE-2026-5038

cve-icon Vulnrichment

Updated: 2026-06-15T16:07:33.955Z

cve-icon NVD

Status : Analyzed

Published: 2026-06-15T16:16:34.423

Modified: 2026-06-16T16:59:41.270

Link: CVE-2026-5038

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses