CVE-2026-5079 (GCVE-0-2026-5079)

Vulnerability from cvelistv5 – Published: 2026-06-15 13:56 – Updated: 2026-06-15 16:00
VLAI
Title
multer vulnerable to Denial of Service via deeply nested field names
Summary
Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this. Patches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires. Workarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-15 16:00 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
openjs CNA under the redhat root
CNA scorecard C 65/100 over 119 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
multer multer Affected: 1.0.0 , < 2.2.0 (semver)
Unaffected: 2.2.0 (semver)
Affected: 3.0.0-alpha.1 , < 3.0.0-alpha.2 (semver)
Unaffected: 3.0.0-alpha.2 (semver)
guessed Create a notification for this product.
Credits
tndud042713 UlisesGascon
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5079",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-15T16:00:29.855724Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-15T16:00:43.955Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/multer",
          "product": "multer",
          "vendor": "multer",
          "versions": [
            {
              "lessThan": "2.2.0",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.2.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.0.0-alpha.2",
              "status": "affected",
              "version": "3.0.0-alpha.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "3.0.0-alpha.2",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "tndud042713"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "UlisesGascon"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.\n\nPatches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires.\n\nWorkarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact."
            }
          ],
          "value": "Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.\n\nPatches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires.\n\nWorkarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-15T13:56:45.520Z",
        "orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "shortName": "openjs"
      },
      "references": [
        {
          "url": "https://github.com/expressjs/multer/security/advisories/GHSA-72gw-mp4g-v24j"
        },
        {
          "url": "https://cna.openjsf.org/security-advisories.html"
        }
      ],
      "title": "multer vulnerable to Denial of Service via deeply nested field names",
      "x_generator": {
        "engine": "cve-kit 1.0.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
    "assignerShortName": "openjs",
    "cveId": "CVE-2026-5079",
    "datePublished": "2026-06-15T13:56:45.520Z",
    "dateReserved": "2026-03-28T19:04:56.443Z",
    "dateUpdated": "2026-06-15T16:00:43.955Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-5079",
      "date": "2026-10-23",
      "epss": "0.00488",
      "percentile": "0.41087"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "packageURL": "pkg:npm/multer",
                "product": "multer",
                "vendor": "multer",
                "versions": [
                  {
                    "lessThan": "2.2.0",
                    "status": "affected",
                    "version": "1.0.0",
                    "versionType": "semver"
                  },
                  {
                    "status": "unaffected",
                    "version": "2.2.0",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "3.0.0-alpha.2",
                    "status": "affected",
                    "version": "3.0.0-alpha.1",
                    "versionType": "semver"
                  },
                  {
                    "status": "unaffected",
                    "version": "3.0.0-alpha.2",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "ce714d77-add3-4f53-aff5-83d477b104bb"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:expressjs:multer:*:*:*:*:*:node.js:*:*",
                    "matchCriteriaId": "1E348250-84AB-45C6-9620-BE6B36746814",
                    "versionEndExcluding": "2.2.0",
                    "versionStartIncluding": "1.0.0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:expressjs:multer:3.0.0:alpha1:*:*:*:node.js:*:*",
                    "matchCriteriaId": "F23451DE-A7F1-46E8-9023-CA415ED56050",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.\n\nPatches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires.\n\nWorkarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact."
          }
        ],
        "id": "CVE-2026-5079",
        "lastModified": "2026-06-17T10:58:24.257",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-5079",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-15T16:00:29.855724Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-06-15T14:16:37.293",
        "references": [
          {
            "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://cna.openjsf.org/security-advisories.html"
          },
          {
            "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
            "tags": [
              "Mitigation",
              "Vendor Advisory"
            ],
            "url": "https://github.com/expressjs/multer/security/advisories/GHSA-72gw-mp4g-v24j"
          }
        ],
        "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-400"
              }
            ],
            "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-08T22:48:06+00:00",
      "cve": "CVE-2026-5079",
      "id": "CVE-2026-5079",
      "initial_release_date": "2026-06-15T13:56:45.520000+00:00",
      "product_status:fixed": "6",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "32",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "multer: Multer: Denial of Service via deeply nested field names in multipart form data",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5079.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-5079",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-15T16:00:29.855724Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-06-15T16:00:37.960Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "packageURL": "pkg:npm/multer",
              "product": "multer",
              "vendor": "multer",
              "versions": [
                {
                  "lessThan": "2.2.0",
                  "status": "affected",
                  "version": "1.0.0",
                  "versionType": "semver"
                },
                {
                  "status": "unaffected",
                  "version": "2.2.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.0.0-alpha.2",
                  "status": "affected",
                  "version": "3.0.0-alpha.1",
                  "versionType": "semver"
                },
                {
                  "status": "unaffected",
                  "version": "3.0.0-alpha.2",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "reporter",
              "value": "tndud042713"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "UlisesGascon"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.\n\nPatches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires.\n\nWorkarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact."
                }
              ],
              "value": "Impact: multer versions 1.0.0 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.\n\nPatches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease) and configure the new limits.fieldNestingDepth option to the minimum depth their application requires.\n\nWorkarounds: Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-400",
                  "description": "CWE-400: Uncontrolled Resource Consumption",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-15T13:56:45.520Z",
            "orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
            "shortName": "openjs"
          },
          "references": [
            {
              "url": "https://github.com/expressjs/multer/security/advisories/GHSA-72gw-mp4g-v24j"
            },
            {
              "url": "https://cna.openjsf.org/security-advisories.html"
            }
          ],
          "title": "multer vulnerable to Denial of Service via deeply nested field names",
          "x_generator": {
            "engine": "cve-kit 1.0.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "assignerShortName": "openjs",
        "cveId": "CVE-2026-5079",
        "datePublished": "2026-06-15T13:56:45.520Z",
        "dateReserved": "2026-03-28T19:04:56.443Z",
        "dateUpdated": "2026-06-15T16:00:43.955Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.