PT-2026-22952 · Npm · Multer

Ulises Gascón + 1 · CVE-2026-3520 · Published 2026-03-04 · Updated 2026-07-09

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Multer versions prior to 2.1.1

Description A flaw exists in Multer, a node.js middleware used for processing multipart/form-data. This issue can be exploited to cause a Denial of Service (DoS) by submitting specially crafted requests, which may lead to a stack overflow.

Recommendations Upgrade to version 2.1.1 to address the issue.

Exploit

Fix

DoS

Allocation of Resources Without Limits

Uncontrolled Recursion

Weakness Enumeration

CWE-770

CWE-674

Related Identifiers

CVE-2026-3520

GHSA-5528-5VMV-3XC2

Affected Products

Multer

References · 19

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3520.json · Exploit
• https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752 · Patch
• https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-3520 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3520 · Security Note
• https://osv.dev/vulnerability/GHSA-5528-5vmv-3xc2 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-APP-NPM-CVE-2026-3520 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:6174 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:6802 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-3520 · Security Note
• https://github.com/expressjs/multer · Note
• https://access.redhat.com/security/cve/CVE-2026-3520 · Note
• https://reddit.com/r/ClaudeAI/comments/1rwh9kt/made_this_for_everyone_who_makes_html_landing · Reddit Post
• https://t.me/CVEtracker/46325 · Telegram Post
• https://bugzilla.redhat.com/show_bug.cgi?id=2444584 · Note