GHSA-5528-5VMV-3XC2

Vulnerability from github – Published: 2026-03-05 00:27 – Updated: 2026-03-05 00:27
VLAI?
Summary
Multer Vulnerable to Denial of Service via Uncontrolled Recursion
Details

Impact

A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.

Patches

Users should upgrade to 2.1.1

Workarounds

None

Resources

  • 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
Severity ?
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "multer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-3520"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-674"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-05T00:27:50Z",
    "nvd_published_at": "2026-03-04T17:16:22Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nA vulnerability in Multer versions \u003c 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.\n\n### Patches\n\nUsers should upgrade to `2.1.1`\n\n### Workarounds\n\nNone\n\n### Resources\n\n- https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2\n- https://www.cve.org/CVERecord?id=CVE-2026-3520\n- https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752\n- https://cna.openjsf.org/security-advisories.html",
  "id": "GHSA-5528-5vmv-3xc2",
  "modified": "2026-03-05T00:27:50Z",
  "published": "2026-03-05T00:27:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3520"
    },
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752"
    },
    {
      "type": "WEB",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/expressjs/multer"
    },
    {
      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-3520"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Multer Vulnerable to Denial of Service via Uncontrolled Recursion"
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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