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CVE-2026-94440

Status: Awaiting AnalysisHigh (7.5)—

Parsing a multipart form can bypass memory limits and read an arbitrarily long line into memory when the remaining limit at the start of a part is less than 400 bytes.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

AV:N/AC:L/PR:N/UI:N indica explotación remota sin autenticación (T1190). CWE-770 (asignación de recursos sin límites) y descripción de bypass de límites de memoria causa negación de servicio por agotamiento de recursos.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-94440",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-94440",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-09T16:09:04.864512Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@golang.org",
      "affectedData": [
        {
          "vendor": "Go standard library",
          "product": "net/textproto",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "1.26.9",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "1.27.0-0",
              "lessThan": "1.27.2",
              "versionType": "semver"
            }
          ],
          "packageName": "net/textproto",
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "readMIMEHeader"
            },
            {
              "name": "Reader.readContinuedLineSlice"
            },
            {
              "name": "Reader.ReadContinuedLine"
            },
            {
              "name": "Reader.ReadContinuedLineBytes"
            },
            {
              "name": "Reader.ReadMIMEHeader"
            }
          ]
        },
        {
          "vendor": "Go standard library",
          "product": "mime/multipart",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "1.26.9",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "1.27.0-0",
              "lessThan": "1.27.2",
              "versionType": "semver"
            }
          ],
          "packageName": "mime/multipart",
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "Part.populateHeaders"
            },
            {
              "name": "Reader.readForm"
            },
            {
              "name": "Reader.NextPart"
            },
            {
              "name": "Reader.NextRawPart"
            },
            {
              "name": "Reader.ReadForm"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-10-08T23:17:04.917",
  "references": [
    {
      "url": "https://go.dev/cl/847307",
      "source": "security@golang.org"
    },
    {
      "url": "https://go.dev/issue/81741",
      "source": "security@golang.org"
    },
    {
      "url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI",
      "source": "security@golang.org"
    },
    {
      "url": "https://pkg.go.dev/vuln/GO-2026-6608",
      "source": "security@golang.org"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Parsing a multipart form can bypass memory limits and read an arbitrarily long line into memory when the remaining limit at the start of a part is less than 400 bytes."
    }
  ],
  "lastModified": "2026-10-09T17:16:50.907",
  "sourceIdentifier": "security@golang.org"
}