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Medium, CVSS 5.3amended

Multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads

CVE-2026-5038GHSA-3p4h-7m6x-2hcm

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (multer 3.0.0-alpha.2, 2.2.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm multer

    Affected
    >= 2.0.0-alpha.1, < 2.2.0>= 3.0.0-alpha.1, < 3.0.0-alpha.2
    Fixed in
    2.2.0, 3.0.0-alpha.2

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS
  • CVE-2026-5038: 0.37% estimated exploitation activity in the next 30 days; percentile 30.60 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact A vulnerability in Multer allows an attacker to trigger a Denial of Service (DoS) by aborting or sending malformed multipart uploads, causing orphaned partial files to accumulate on disk when using diskStorage. Patches Users should upgrade to 2.2.0, 3.0.0-alpha.2 or higher Workarounds None

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-3p4h-7m6x-2hcm

  2. Revision 1 · created ·

    Published from osv record GHSA-3p4h-7m6x-2hcm

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-5038

Advisory: Multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads
IDs: CVE-2026-5038, GHSA-3p4h-7m6x-2hcm
Record: https://patchnext.com/advisories/cve-2026-5038 (revision 2, source checked 26 Oct 2026, 12:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: multer 3.0.0-alpha.2, 2.2.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm multer: affected >= 2.0.0-alpha.1, < 2.2.0; >= 3.0.0-alpha.1, < 3.0.0-alpha.2; fixed in 2.2.0, 3.0.0-alpha.2

## Suggested inspection (read-only)
- `npm ls multer --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on multer.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-3p4h-7m6x-2hcm (OSV record GHSA-3p4h-7m6x-2hcm lists affected ranges: npm multer >=2.0.0-alpha.1 =3.0.0-alpha.1 <3.0.0-alpha.2 (fixed))
- Verified: https://github.com/advisories/GHSA-3p4h-7m6x-2hcm (GitHub-reviewed advisory GHSA-3p4h-7m6x-2hcm lists affected ranges: npm multer >=2.0.0-alpha.1 =3.0.0-alpha.1 <3.0.0-alpha.2)

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