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Vulnerabilities

Vulnerability · CVE-2026-3520

Multer is a node.js middleware for handling .

Published Mar 4, 2026 · catalog updated Jul 15, 2026 · Multer is a node.js

Check if you run it

No confirmed exploitation is on record for CVE-2026-3520. EPSS is 0.98%. Act only if a listed version of Multer is a node.js is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Multer is a node.js).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.98%
Remediation
Advisory link
Affected products
cpe expressjs/multer

Multer is a node.js middleware for handling . A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe expressjs/multerversion unspecified

How to fix CVE-2026-3520

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-3520. EPSS is 0.98%. Act only if a listed version of Multer is a node.js is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-674; CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 0.98%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 4, 2026 · NIST NVD

    Detected

    Multer is a node.js middleware for handling . A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.

  2. Jul 15, 2026 · NIST NVD

    Updated

    Multer is a node.js middleware for handling . A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.

Sources

  • CVE.orgVulnerability recordCVE-2026-3520

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-3520

    30-day exploitation probability 1.0%

    first.org
  • NIST NVDVulnerability recordCVE-2026-3520

    Multer is a node.js middleware for handling . A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.