CVE-2026-97209

{
  "id": "CVE-2026-97209",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "published": "2026-10-30T09:17:15.640",
  "lastModified": "2026-10-30T09:17:15.640",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Insecure Temporary File vulnerability in Mix deps.partition in Elixir allows a local user to execute code as another user via a swapped partition config file. Partitioned dependency compilation passes the project configuration to each partition VM through a file in a fixed-name directory under the shared system temporary directory, and the partition trusts what it reads back. Another local user on the same host can exploit this during a mix deps.compile run that uses partitioned compilation.\n\nMix.Tasks.Deps.Partition.server/4 in lib/mix/lib/mix/tasks/deps.partition.ex creates the directory with File.mkdir_p/1, which accepts an existing directory without checking its owner, so a user who created it first can replace the file before client/0 reads it.\n\nThis issue affects mix: from 1.20.0-rc.4 before 1.20.5."
    }
  ],
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "vendor": "elixir-lang",
          "product": "elixir",
          "defaultStatus": "unaffected",
          "packageName": "mix",
          "cpes": [
            "cpe:2.3:a:elixir-lang:elixir:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "'Elixir.Mix.Tasks.Deps.Partition'"
          ],
          "programFiles": [
            "lib/mix/tasks/deps.partition.ex"
          ],
          "programRoutines": [
            {
              "name": "'Elixir.Mix.Tasks.Deps.Partition':server/3"
            },
            {
              "name": "'Elixir.Mix.Tasks.Deps.Partition':server/4"
            },
            {
              "name": "'Elixir.Mix.Tasks.Deps.Partition':client/0"
            }
          ],
          "repo": "https://github.com/elixir-lang/elixir",
          "packageURL": "pkg:otp/mix?repository_url=https:%2F%2Fgithub.com%2Felixir-lang%2Felixir&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Felixir-lang%2Felixir.git",
          "versions": [
            {
              "version": "1.20.0-rc.4",
              "lessThan": "1.20.5",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "elixir-lang",
          "product": "elixir",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com",
          "packageName": "elixir-lang/elixir",
          "cpes": [
            "cpe:2.3:a:elixir-lang:elixir:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "'Elixir.Mix.Tasks.Deps.Partition'"
          ],
          "programFiles": [
            "lib/mix/lib/mix/tasks/deps.partition.ex"
          ],
          "programRoutines": [
            {
              "name": "'Elixir.Mix.Tasks.Deps.Partition':server/3"
            },
            {
              "name": "'Elixir.Mix.Tasks.Deps.Partition':server/4"
            },
            {
              "name": "'Elixir.Mix.Tasks.Deps.Partition':client/0"
            }
          ],
          "repo": "https://github.com/elixir-lang/elixir",
          "packageURL": "pkg:github/elixir-lang/elixir",
          "versions": [
            {
              "version": "7f3d95b60c28ae3026a5c1bf943166391245bfd1",
              "lessThan": "*",
              "versionType": "git",
              "status": "affected",
              "changes": [
                {
                  "at": "55eb91220a1de14dc5aa27029d1f45b0f5832b2d",
                  "status": "unaffected"
                },
                {
                  "at": "9adbe955c8664f4be77d879dd38c003dd39fa777",
                  "status": "unaffected"
                }
              ]
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "LOW",
          "userInteraction": "PASSIVE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-377"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-97209.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-lang/elixir/commit/55eb91220a1de14dc5aa27029d1f45b0f5832b2d",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-lang/elixir/commit/7f3d95b60c28ae3026a5c1bf943166391245bfd1",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-lang/elixir/commit/9adbe955c8664f4be77d879dd38c003dd39fa777",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-lang/elixir/security/advisories/GHSA-96q6-xhwp-fc8q",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-97209",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ]
}