PYSEC-2026-1604

Vulnerability from pysec - Published: 2026-07-07 16:02 - Updated: 2026-07-07 17:24
VLAI
Details

python-markdownify (aka markdownify) before 0.14.1 allows large headline prefixes such as in addition to

through

. This causes memory consumption.

Severity
2.9 (Low)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Impacted products
Name purl
markdownify pkg:pypi/markdownify
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "markdownify",
        "purl": "pkg:pypi/markdownify"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.14.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.10.0",
        "0.10.1",
        "0.10.2",
        "0.10.3",
        "0.11.0",
        "0.11.1",
        "0.11.2",
        "0.11.4",
        "0.11.5",
        "0.11.6",
        "0.12.1",
        "0.13.0",
        "0.13.1",
        "0.14.0",
        "0.2.0",
        "0.3.0",
        "0.4.0",
        "0.4.1",
        "0.5.1",
        "0.5.2",
        "0.5.3",
        "0.6.0",
        "0.6.1",
        "0.6.3",
        "0.6.4",
        "0.6.5",
        "0.6.6",
        "0.7.0",
        "0.7.1",
        "0.7.2",
        "0.7.3",
        "0.7.4",
        "0.8.0",
        "0.8.1",
        "0.9.0",
        "0.9.2",
        "0.9.3",
        "0.9.4"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-46656",
    "GHSA-7mpr-5m44-h73r"
  ],
  "details": "python-markdownify (aka markdownify) before 0.14.1 allows large headline prefixes such as \u003ch9999999\u003e in addition to \u003ch1\u003e through \u003ch6\u003e. This causes memory consumption.",
  "id": "PYSEC-2026-1604",
  "modified": "2026-07-07T17:24:38.040163Z",
  "published": "2026-07-07T16:02:51.414781Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-46656"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matthewwithanm/python-markdownify/issues/143"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matthewwithanm/python-markdownify/commit/959561879693bf4a576f99c6733b50b01186aa08"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matthewwithanm/python-markdownify"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matthewwithanm/python-markdownify/compare/0.14.0...0.14.1"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/markdownify"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-7mpr-5m44-h73r"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "markdownify allows large headline prefixes such as \u003ch9999999\u003e, which causes memory consumption"
}



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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.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.