FKIE_CVE-2026-102734

Vulnerability from fkie_nvd - Published: 2026-10-13 16:17 - Updated: 2026-10-13 21:17
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Summary
asteval is a Python expression evaluator designed for restricted execution. Prior to 1.0.9, in asteval/astutils.py, the default Interpreter with numpy enabled exposes a ctypes type and permits from_address memory access. safe_getattr blocks the ctypes module but not reachable ctypes type objects, while attribute assignments use unfiltered setattr instead of safe_setattr. An attacker-controlled expression can derive an address with id, read memory through from_address, and write through an attribute assignment. The expression can read or corrupt arbitrary process memory, escape the intended sandbox, execute code, disclose secrets, or crash the host process. This issue is fixed in version 1.0.9.
References
security-advisories@github.comhttps://github.com/lmfit/asteval/commit/a3e56e7f8ed567a4817684d94213b290359077b4
security-advisories@github.comhttps://github.com/lmfit/asteval/pull/153
security-advisories@github.comhttps://github.com/lmfit/asteval/releases/tag/1.0.9
security-advisories@github.comhttps://github.com/lmfit/asteval/security/advisories/GHSA-9w56-46f6-3qhx
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "asteval",
          "vendor": "lmfit",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.0.9"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "asteval is a Python expression evaluator designed for restricted execution. Prior to 1.0.9, in asteval/astutils.py, the default Interpreter with numpy enabled exposes a ctypes type and permits from_address memory access. safe_getattr blocks the ctypes module but not reachable ctypes type objects, while attribute assignments use unfiltered setattr instead of safe_setattr. An attacker-controlled expression can derive an address with id, read memory through from_address, and write through an attribute assignment. The expression can read or corrupt arbitrary process memory, escape the intended sandbox, execute code, disclose secrets, or crash the host process. This issue is fixed in version 1.0.9."
    }
  ],
  "id": "CVE-2026-102734",
  "lastModified": "2026-10-13T21:17:20.823",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-102734",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-13T20:13:07.578455Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-13T16:17:09.820",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/lmfit/asteval/commit/a3e56e7f8ed567a4817684d94213b290359077b4"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/lmfit/asteval/pull/153"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/lmfit/asteval/releases/tag/1.0.9"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/lmfit/asteval/security/advisories/GHSA-9w56-46f6-3qhx"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-693"
        },
        {
          "lang": "en",
          "value": "CWE-749"
        },
        {
          "lang": "en",
          "value": "CWE-913"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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