PYSEC-2026-921

Vulnerability from pysec - Published: 2026-07-06 08:03 - Updated: 2026-07-07 11:31
VLAI
Details

Array index error in the scanstring function in the _json module in Python 2.7 through 3.5 and simplejson before 2.6.1 allows context-dependent attackers to read arbitrary process memory via a negative index value in the idx argument to the raw_decode function.

Severity
5.9 (Medium)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Impacted products
Name purl
simplejson pkg:pypi/simplejson
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "simplejson",
        "purl": "pkg:pypi/simplejson"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1",
        "1.3",
        "1.4",
        "1.5",
        "1.6",
        "1.7",
        "1.7.1",
        "1.7.2",
        "1.7.3",
        "1.7.4",
        "1.7.5",
        "1.8",
        "1.8.1",
        "1.9",
        "1.9.1",
        "1.9.2",
        "1.9.3",
        "2.0.0",
        "2.0.1",
        "2.0.2",
        "2.0.3",
        "2.0.4",
        "2.0.5",
        "2.0.6",
        "2.0.7",
        "2.0.8",
        "2.0.9",
        "2.1.0",
        "2.1.0rc3",
        "2.1.1",
        "2.1.2",
        "2.1.3",
        "2.1.4",
        "2.1.5",
        "2.1.6",
        "2.2.0",
        "2.2.1",
        "2.3.0",
        "2.3.1",
        "2.3.2",
        "2.3.3",
        "2.4.0",
        "2.5.0",
        "2.5.1",
        "2.5.2",
        "2.6.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2014-4616",
    "GHSA-9772-cwx9-r4cj"
  ],
  "details": "Array index error in the scanstring function in the _json module in Python 2.7 through 3.5 and simplejson before 2.6.1 allows context-dependent attackers to read arbitrary process memory via a negative index value in the idx argument to the raw_decode function.",
  "id": "PYSEC-2026-921",
  "modified": "2026-07-07T11:31:07.937196Z",
  "published": "2026-07-06T08:03:23.234177Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2014-4616"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/12297"
    },
    {
      "type": "WEB",
      "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=752395"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1112285"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/simplejson/simplejson"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/201503-10"
    },
    {
      "type": "WEB",
      "url": "http://bugs.python.org/issue21529"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-updates/2014-07/msg00015.html"
    },
    {
      "type": "WEB",
      "url": "http://openwall.com/lists/oss-security/2014/06/24/7"
    },
    {
      "type": "WEB",
      "url": "http://rhn.redhat.com/errata/RHSA-2015-1064.html"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/68119"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/simplejson"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-9772-cwx9-r4cj"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "simplejson before 2.6.1 vulnerable to array index error"
}



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