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CVE-2026-49114

Estado: AnalizadaMedia (6.8)—

In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A local attacker with write access to the directory where a victim serializes external data can deterministically pre-plant a symlink that is being followed, causing the victim's write to append to any file the victim can write, e.g. ~/.ssh/authorized_keys, cron files, or application configs. Fixed in 1.21.0.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linuxfoundation — Onnx

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-49114",
  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
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          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
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          "confidentialityImpact": "NONE"
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          "Automatable": "NOT_DEFINED",
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          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/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",
          "exploitMaturity": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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  "published": "2026-08-21T16:17:17.863",
  "references": [
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      "url": "https://github.com/onnx/onnx/security/advisories/GHSA-q56x-g2fj-4rj6",
      "tags": [
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        "Vendor Advisory"
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    {
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    {
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      "tags": [
        "Third Party Advisory",
        "VDB Entry"
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      "source": "9119a7d8-5eab-497f-8521-727c672e3725"
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  "weaknesses": [
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      "source": "9119a7d8-5eab-497f-8521-727c672e3725",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-59"
        },
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A local attacker with write access to the directory where a victim serializes external data can deterministically pre-plant a symlink that is being followed, causing the victim's write to append to any file the victim can write, e.g. ~/.ssh/authorized_keys, cron files, or application configs. Fixed in 1.21.0."
    }
  ],
  "lastModified": "2026-09-16T13:55:10.540",
  "configurations": [
    {
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        {
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          "cpeMatch": [
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              "criteria": "cpe:2.3:a:linuxfoundation:onnx:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "1.21.0"
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  "sourceIdentifier": "9119a7d8-5eab-497f-8521-727c672e3725"
}