TI-2025-30337 Aliases CVE-2025-47944 GHSA-4pg4-qvpc-4q3h

Multer vulnerable to Denial of Service from maliciously crafted requests

MEDIUM 40CWE-248Published 2025-05-19 · Updated 2025-05-20

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-248.

Summary

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.0 allows an attacker to trigger a Denial of Service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to version 2.0.0 to receive a patch. No known workarounds are available.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00811 57th percentileScored 2026-11-07

Fix Fixed multer (expressjs): 2.0.0multer (npm): 2.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
expressjs	multer	1.4.4-lts.1 to before 2.0.0	2.0.0	Patch available	CNA
—	multer (npm)	1.4.4-lts.1 to before 2.0.0	2.0.0	Patch available	GHSA-4pg4-qvpc-4q3h

multer Vendorexpressjs Affected 1.4.4-lts.1 to before 2.0.0 Fixed in 2.0.0 Patch available CNA
multer (npm) Vendor— Affected 1.4.4-lts.1 to before 2.0.0 Fixed in 2.0.0 Patch available GHSA-4pg4-qvpc-4q3h

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:expressjs:multer::::::::	—	—	expressjs

cpe:2.3:a:expressjs:multer:*:*:*:*:*:*:*:* Versions — — ·expressjs

Remediation

Fix · CNA multer (expressjs) Fixed in 2.0.0
Fix · GHSA-4pg4-qvpc-4q3h multer (npm) Fixed in 2.0.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2025-47944
2026-10-03 Alias added: GHSA-4pg4-qvpc-4q3h

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2025-47944

Other 4

TI-2024-08602 Open redirect in expressjs express CVSS 3.1MEDIUM 4.7
TI-2026-03033 Multer vulnerable to Denial of Service via uncontrolled recursion CVSS 4.0HIGH 8.7
TI-2026-02853 Multer vulnerable to Denial of Service via incomplete cleanup CVSS 4.0HIGH 8.7
TI-2026-01995 Multer vulnerable to Denial of Service via resource exhaustion CVSS 4.0HIGH 8.7
TI-2025-31125 Multer vulnerable to Denial of Service via unhandled exception CVSS 4.0HIGH 8.7
TI-2025-30328 Multer vulnerable to Denial of Service via memory leaks from unclosed streams CVSS 3.1HIGH 7.5

See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences