StackPrism

npm package

multer 2.0.0 vulnerabilities, and the version that fixes all of them

multer 2.0.0 has 10 known vulnerabilities (8 rated high or critical); 2.3.0 fixes all of them. 2.3.0 has 1 known vulnerability of its own, so upgrade to 2.4.0, which has none.

npm (opens in a new tab) describes it as “Middleware for handling `multipart/form-data`.”

Known vulnerabilities
10
8 rated high or critical
Released
May 19, 2025
Latest is 2.4.0
Downloads last week
32.4K
Under 1% of multer downloads
Licence
MIT
OpenSSF Scorecard
7.3/10
expressjs/multer (opens in a new tab)
Pulls in
22 packages
Resolved by deps.dev

What to upgrade to

2.4.0 is the closest release with no known vulnerabilities that we checked.

  • 2.3.0

    Fixes all 10 known vulnerabilities. Released Aug 28, 2026.

    1 known vulnerability, worst rated warning

  • 2.4.0Upgrade to this

    Newest 2.x release and the latest release. Released Sep 14, 2026.

    No known vulnerabilities

2.4.0 came out on Sep 14, 2026. A coding agent trained before then doesn’t know it exists, so it may suggest an older release. AI knowledge cutoff dates

Hand the fix to your coding agent

One task with the upgrade, the file to change and why. Paste it into Claude Code, Cursor or Codex.

Findings

Every advisory for multer 2.0.0

Known exploited first (CISA KEV), then by how likely they are to be exploited (FIRST EPSS), then by severity. Each id links to its OSV.dev record.

  1. CriticalCVE-2026-3520 on OSV.dev (opens in a new tab)GHSA-5528-5vmv-3xc2EPSS: top 39%

    Multer Vulnerable to Denial of Service via Uncontrolled Recursion

    Fixed in 2.1.1. Published Mar 5, 2026.

  2. CriticalCVE-2026-3304 on OSV.dev (opens in a new tab)GHSA-xf7r-hgr6-v32pEPSS: top 42%

    Multer vulnerable to Denial of Service via incomplete cleanup

    Fixed in 2.1.0. Published Mar 1, 2026.

  3. CriticalCVE-2025-7338 on OSV.dev (opens in a new tab)GHSA-fjgf-rc76-4x9pEPSS: top 46%

    Multer vulnerable to Denial of Service via unhandled exception from malformed request

    Fixed in 2.0.2. Published Jul 17, 2025.

  4. CriticalCVE-2026-2359 on OSV.dev (opens in a new tab)GHSA-v52c-386h-88mcEPSS: top 49%

    Multer vulnerable to Denial of Service via resource exhaustion

    Fixed in 2.1.0. Published Mar 1, 2026.

  5. CriticalCVE-2026-77078 on OSV.dev (opens in a new tab)GHSA-wc9g-mqfw-jrwmEPSS: top 60%

    multer vulnerable to Denial of Service via crafted multipart field names

    Fixed in 2.3.0. Published Sep 8, 2026.

  6. CriticalCVE-2026-82333 on OSV.dev (opens in a new tab)GHSA-535w-7cp7-47q4EPSS: top 60%

    multer vulnerable to Denial of Service via oversized array index in field names

    Fixed in 2.3.0. Published Sep 8, 2026.

  7. CriticalCVE-2026-5079 on OSV.dev (opens in a new tab)GHSA-72gw-mp4g-v24jEPSS: top 60%

    Multer vulnerable to Denial of Service via deeply nested field names

    Fixed in 2.2.0. Published Jun 17, 2026.

  8. WarningCVE-2026-5038 on OSV.dev (opens in a new tab)GHSA-3p4h-7m6x-2hcmEPSS: top 60%

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

    Fixed in 2.2.0. Published Jun 17, 2026.

  9. CriticalCVE-2025-48997 on OSV.dev (opens in a new tab)GHSA-g5hg-p3ph-g8qgEPSS: top 64%

    Multer vulnerable to Denial of Service via unhandled exception

    Fixed in 2.0.1. Published Jun 5, 2025.

  10. LowCVE-2026-77063 on OSV.dev (opens in a new tab)GHSA-qvfw-j98x-7q72EPSS: top 87%

    multer vulnerable to file size limit bypass via async fileFilter race condition

    Fixed in 2.3.0. Published Sep 8, 2026.

Who is still on a vulnerable multer

65% of last week’s 22.6M multer downloads went to versions with known vulnerabilities.

From npm’s per-version download counts for the last 7 days, each version checked against OSV.dev. The versions checked cover over 99% of downloads.

Is multer the only one?

Paste a public GitHub repo or drop your package.json and see every vulnerable, end-of-life or deprecated dependency, with one fix task. Free, no sign-up.

Check your whole repo

How this page is checked

StackPrism asks OSV.dev which advisories affect exactly multer 2.0.0, merges duplicates filed under several ids, and ranks them with CISA’s Known Exploited Vulnerabilities list and FIRST EPSS. Release dates and deprecation come from deps.dev and npm. No AI writes this page: every sentence comes from that data, refreshed every few hours.

Last checked against npm, OSV.dev, deps.dev, CISA KEV and FIRST EPSS.