Multer vulnerable to Denial of Service from maliciously crafted requests

CVE-2025-47944 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Impact

A vulnerability in Multer versions >=1.4.4-lts.1 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.

Patches

Users should upgrade to 2.0.0

Workarounds

None

References

  • https://github.com/expressjs/multer/issues/1176
  • https://github.com/expressjs/multer/commit/2c8505f207d923dd8de13a9f93a4563e59933665

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2025-05-19 22:16:30 UTC
Updated
2025-05-21 20:37:35 UTC
GitHub reviewed
2025-05-19 22:16:30 UTC
NVD published
2025-05-19

EPSS Score

Score Percentile
0.04% 12.49%

CVSS Scores

Base score Version Severity Vector
7.5 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type Value
GHSA GHSA-4pg4-qvpc-4q3h ↗
CVE CVE-2025-47944 ↗

CWEs

CWE id Name
CWE-248 Uncaught Exception

Credits

  • max-mathieu (reporter)
  • wesleytodd (coordinator)
  • ctcpip (analyst)
  • UlisesGascon (remediation_reviewer)
  • marco-ippolito (remediation_reviewer)
  • jonchurch (remediation_reviewer)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
npm multer >= 1.4.4-lts.1, < 2.0.0 2.0.0 —

References

cvelogic Threat Intelligence