HOMEVULNERABILITIESCVE-2026-3520
HIGH

CVE-2026-3520

CWE-674Published: March 4, 2026· Updated: Mar 9, 2026

7.5
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:12.7th

Official Description

Multer is a node.js middleware for handling `multipart/form-data`. 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.

NVD Source

Technical Analysis

CVE-2026-3520 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

expressjs1 product
multer
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752
ADVISORYhttps://cna.openjsf.org/security-advisories.html
ADVISORYhttps://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2
ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2026-3520

All References (4)

→
https://cna.openjsf.org/security-advisories.htmlThird Party Advisory
→
https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752Patch
→
https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2Vendor Advisory
→
https://www.cve.org/CVERecord?id=CVE-2026-3520Third Party Advisory

Quick Facts

CVE IDCVE-2026-3520
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-674
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedMar 4, 2026

Related CVEs (CWE-674)

CVE-2026-25971
9.8
CVE-2026-40324
9.1
CVE-2026-41673
8.7
CVE-2026-25048
8.7
CVE-2026-8936
8.2
CVE-2026-40879
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-3520 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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