Vulnerability-Lookup

GHSA-3P4H-7M6X-2HCM

Vulnerability from github – Published: 2026-06-17 18:11 – Updated: 2026-06-17 18:11

Summary

Multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads

Details

Impact

A vulnerability in Multer allows an attacker to trigger a Denial of Service (DoS) by aborting or sending malformed multipart uploads, causing orphaned partial files to accumulate on disk when using diskStorage.

Patches

Users should upgrade to 2.2.0, 3.0.0-alpha.2 or higher

Workarounds

None

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "multer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0-alpha.1"
            },
            {
              "fixed": "2.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "multer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0-alpha.1"
            },
            {
              "fixed": "3.0.0-alpha.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-5038"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-459"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-17T18:11:48Z",
    "nvd_published_at": "2026-06-15T16:16:34Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nA vulnerability in Multer allows an attacker to trigger a Denial of Service (DoS) by aborting or sending malformed multipart uploads, causing orphaned partial files to accumulate on disk when using diskStorage.\n\n### Patches\n\nUsers should upgrade to `2.2.0`, `3.0.0-alpha.2` or higher\n\n### Workarounds\n\nNone",
  "id": "GHSA-3p4h-7m6x-2hcm",
  "modified": "2026-06-17T18:11:48Z",
  "published": "2026-06-17T18:11:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/expressjs/multer/security/advisories/GHSA-3p4h-7m6x-2hcm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5038"
    },
    {
      "type": "WEB",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/expressjs/multer"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads"
}

CVE-2026-5038 (GCVE-0-2026-5038)

Vulnerability from cvelistv5 – Published: 2026-06-15 14:23 – Updated: 2026-06-15 16:07

Title

multer vulnerable to Denial of Service via incomplete cleanup of aborted uploads

Summary

Impact: multer versions 2.0.0-alpha.1 through 2.1.1 and 3.0.0-alpha.1 are vulnerable to a Denial of Service 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. An attacker can exhaust disk space by triggering many aborted uploads, with no application bug required. Patches: Users should upgrade to multer 2.2.0 (2.x line) or 3.0.0-alpha.2 (3.x prerelease). Both versions track in-flight write streams and clean them up on the abort path. Workarounds: None.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-15 16:07 UTC

CWE

CWE-459 - Incomplete Cleanup

Assigner

openjs redhat root

References

2 references

URL	Tags
https://github.com/expressjs/multer/security/advi…
https://cna.openjsf.org/security-advisories.html

Impacted products

1 product

Vendor	Product	Version
multer	multer	Affected: 2.0.0-alpha.1 , < 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)

Credits

yuki-matsuhashi HamdaanAliQuatil fasrm UlisesGascon bjohansebas 0xStraw-Hat bhaswanthc ByamB4 sbouabid-sec DavidCarliez JebeenLee

Show details on NVD website

JSON

To clipboard

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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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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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.