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CVE-2026-2359

Multer vulnerable to Denial of Service via resource exhaustion

8.7 HighFix available

Multer is a node.js middleware for handling multipart/form-data. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.74%Up 0.7 points since Feb 28, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.7

Multer vulnerable to Denial of Service via resource exhaustion

Multer is a node.js middleware for handling multipart/form-data. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

Record
CVE-2026-2359
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-772, CWE-772
Updated
2026-11-02
EUVDEUVD-2026-9032 8.7

Multer is a node.js middleware for handling multipart/form-data. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

Record
EUVD-2026-9032
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-v52c-386h-88mc 8.7

Multer vulnerable to Denial of Service via resource exhaustion

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Record
GHSA-v52c-386h-88mc
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-772
Updated
2026-11-02
NVD 8.7

Multer is a node.js middleware for handling multipart/form-data. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

Record
CVE-2026-2359
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-772
Updated
2026-11-02
OSV 8.7

Multer vulnerable to Denial of Service via resource exhaustion

Multer is a node.js middleware for handling multipart/form-data. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

Record
CVE-2026-2359
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-772
Updated
2026-11-02
OSVGHSA-v52c-386h-88mc 8.7

Multer vulnerable to Denial of Service via resource exhaustion

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Record
GHSA-v52c-386h-88mc
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-772
Updated
2026-11-02
OSVROOT-APP-NPM-CVE-2026-2359 No score

CVE-2026-2359 in multer - Patched by Root

Root has patched CVE-2026-2359 in the multer package for Root:npm. Multiple fixed versions available.

Record
ROOT-APP-NPM-CVE-2026-2359
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
multer
npm
 before 2.1.0
2.1.0
multer
Root:npm
 before 1.4.4-lts.1-aikido.3
1.4.4-lts.1-aikido.31.4.5-lts.2-aikido.91.4.4-lts.1-aikido.41.4.4-aikido.21.4.2-aikido.12.0.2-aikido.41.4.5-lts.1-aikido.21.4.5-lts.1-aikido.32.0.2-aikido.52.0.2-aikido.61.4.4-aikido.31.4.4-lts.1-aikido.11.4.4-aikido.41.4.5-lts.1-aikido.11.4.4-lts.1-aikido.21.4.4-aikido.51.4.4-aikido.61.4.2-aikido.21.4.5-lts.2-aikido.82.0.2-aikido.7
@rootio/multer
Root:npm
 before 1.4.4-lts.1-root.io.3
1.4.4-lts.1-root.io.31.4.5-lts.2-root.io.92.0.2-root.io.31.4.4-lts.1-root.io.41.4.4-root.io.21.4.4-root.io.11.4.2-root.io.12.0.2-root.io.41.4.5-lts.1-root.io.21.4.5-lts.1-root.io.32.0.2-root.io.52.0.2-root.io.61.4.4-root.io.31.4.4-lts.1-root.io.11.4.4-root.io.41.4.5-lts.1-root.io.11.4.4-lts.1-root.io.21.4.4-root.io.51.4.4-root.io.61.4.2-root.io.21.4.5-lts.2-root.io.82.0.2-root.io.7

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-2359 is a high vulnerability (CVSS 8.7) in Expressjs Multer, published February 27, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.74%, the 54th percentile. Fixed in multer 2.1.0.

References

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