GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

GHSA-44VG-5WV2-H2HG

Vulnerability from github – Published: 2026-03-13 20:56 – Updated: 2026-06-08 19:47
VLAI
Summary
SimpleEval: Objects (including modules) can leak dangerous modules through to direct access inside the sandbox
Details

Impact

If the objects passed in as names to SimpleEval have modules or other disallowed / dangerous objects available as attrs. Additionally, dangerous functions or modules could be accessed by passing them as callbacks to other safe functions to call.

Examples (found by @ByamB4):

Any module where non-underscore attribute chains reach os or sys: - os.path, pathlib, shutil, glob (direct .os / .sys attributes) - statistics (has .sys) - numpy (has .ctypeslib.os and .f2py.sys) - urllib.parse (has .warnings.sys)

Patches

The latest version 1.0.5 has this issue fixed.

Workarounds

Don't pass in objects or modules which have direct attributes to potentially dangerous items. Use a wrapper to wrap the potentially vulnerable items (See the ModuleWrapper in version 1.0.5)

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "simpleeval"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-32640"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-915",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-13T20:56:26Z",
    "nvd_published_at": "2026-03-16T14:19:40Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nIf the objects passed in as `names` to SimpleEval have modules or other disallowed / dangerous objects available as attrs.\nAdditionally, dangerous functions or modules could be accessed by passing them as callbacks to other safe functions to call.\n\nExamples (found by @ByamB4):\n\nAny module where non-underscore attribute chains reach os or sys:\n- os.path, pathlib, shutil, glob (direct .os / .sys attributes)\n- statistics (has .sys)\n- numpy (has .ctypeslib.os and .f2py.sys)\n- urllib.parse (has .warnings.sys)\n\n### Patches\nThe latest version 1.0.5 has this issue fixed.\n\n### Workarounds\nDon\u0027t pass in objects or modules which have direct attributes to potentially dangerous items.\nUse a wrapper to wrap the potentially vulnerable items (See the ModuleWrapper in version 1.0.5)",
  "id": "GHSA-44vg-5wv2-h2hg",
  "modified": "2026-06-08T19:47:08Z",
  "published": "2026-03-13T20:56:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/danthedeckie/simpleeval/security/advisories/GHSA-44vg-5wv2-h2hg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32640"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/danthedeckie/simpleeval"
    },
    {
      "type": "WEB",
      "url": "https://github.com/danthedeckie/simpleeval/releases/tag/1.0.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/simpleeval/PYSEC-2026-132.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2026/04/msg00023.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "SimpleEval: Objects (including modules) can leak dangerous modules through to direct access inside the sandbox"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

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.