8.7

CVE-2026-3304: expressjs multer Incomplete Cleanup

CVSS: 8.7v4.0HighModified
AliasesGHSA-xf7r-hgr6-v32pCGA-7577-g729-36g5CGA-c6hp-jrph-x444
Published 27-02-2026Last modified 15-07-2026
Open JSON

Vulnerability summary

CVE-2026-3304 is a high (CVSS 8.7) Incomplete Cleanup vulnerability in expressjs multer. EPSS estimates a 0.88% chance of exploitation in the next 30 days, higher than 58.4% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.88%
0%100%
Low · +0.22 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-J49G-M3C4-P9GR

Timeline

  1. 27-02-2026
    PublishedVulnerability first disclosed.
  2. 15-07-2026
    Last modifiedVulnerability information updated.

Description

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 sending malformed requests, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.88%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

+0.22 pp

From 0.66% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.88%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard2 products
  • librechat< 0.8.2-r7
  • redisinsight< 3.2.0-r1
Expressjs1 product
  • multer≥ 0.0.0, < 2.1.0 | < 2.1.0
Npm1 product
  • multer< 2.1.0

3 vendors · 4 products

References

12 links
Show all 12 references