CVE-2026-3520

Summary

Multer is a node.js middleware for handling multipart/form-data. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.

Affected Software

Weaknesses

• CWE-674: CWE-674: Uncontrolled Recursion

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

multer: Multer: Denial of Service via malformed requests

Additional References

• https://access.redhat.com/security/cve/CVE-2026-3520
• https://bugzilla.redhat.com/show_bug.cgi?id=2444584
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3520.json
• https://access.redhat.com/errata/RHSA-2026:6174
• https://access.redhat.com/errata/RHSA-2026:6802

References

• https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2
• https://www.cve.org/CVERecord?id=CVE-2026-3520
• https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752
• https://cna.openjsf.org/security-advisories.html

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