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Fencer Vulns
high 8.7

CVE-2025-48997 json

Multer vulnerable to Denial of Service via unhandled exception

published 2025-06-03 17 mo ago modified 2026-09-10 1 mo ago also EUVD-2025-16780 , GHSA-g5hg-p3ph-g8qg

cvss
8.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

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 2.0.1 allows an attacker to trigger a Denial of Service (DoS) by sending an upload file request with an empty string field name. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to `2.0.1` to receive a patch. No known workarounds are available.

Patch / fix

  • npm multer 2.0.1
  • expressjs multer 2.0.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-48997 updated cvss 5.3

multer: Multer vulnerable to Denial of Service via unhandled exception

  • Red Hat OpenShift Serverless openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Developer Hub 1.7 rhdh 1.7.0-1754936470
    fixed: vendor fix RHSA-2025:14090
  • Red Hat Developer Hub 1 rhdh/rhdh-rhel9-operator Red Hat Developer Hub 1.7 rhdh 1.7.0-1754935808, rhdh 1.7.0-1754942441
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
17 mo ago

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS: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

Affected packages

ecosystem package affected fixed in
npm multer
>=1.4.4-lts.1, <2.0.1
2.0.1

Affected products

  • expressjs multer

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.