PT-2026-49242 · Npm · Multer

0Xstraw-Hat + 10 · CVE-2026-5038 · Published 2026-06-15 · Updated 2026-06-23

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions multer versions 2.0.0-alpha.1 through 2.1.1 multer version 3.0.0-alpha.1

Description A Denial of Service issue exists when using diskStorage. Aborted or malformed multipart uploads leave orphaned partial files on disk because the Readable.pipe() call does not propagate the stream destroy signal to the underlying fs.WriteStream. This allows an attacker to exhaust disk space by triggering numerous aborted uploads.

Recommendations Upgrade to version 2.2.0 for versions 2.0.0-alpha.1 through 2.1.1. Upgrade to version 3.0.0-alpha.2 for version 3.0.0-alpha.1.

Exploit

Fix

DoS

Weakness Enumeration

CWE-459

Related Identifiers

CVE-2026-5038

GHSA-3P4H-7M6X-2HCM

Affected Products

Multer

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5038.json · Exploit
• https://github.com/expressjs/multer/security/advisories/GHSA-3p4h-7m6x-2hcm · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-APP-NPM-CVE-2026-5038 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5038 · Security Note
• https://osv.dev/vulnerability/GHSA-3p4h-7m6x-2hcm · Vendor Advisory
• https://cna.openjsf.org/security-advisories.html · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-5038 · Vendor Advisory
• https://github.com/expressjs/multer · Note
• https://t.me/cveNotify/168607 · Telegram Post
• https://twitter.com/kom_256/status/2066528907021402149 · Twitter Post
• https://twitter.com/disismohi/status/2067126743337501118 · Twitter Post