Vulnerability from bitnami_vulndb
Published
2026-08-19 11:37
Modified
2026-08-19 12:00
Summary
Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations
Details

The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "libpython",
        "purl": "pkg:bitnami/libpython"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.10.21"
            },
            {
              "introduced": "3.11.0"
            },
            {
              "fixed": "3.11.16"
            },
            {
              "introduced": "3.12.0"
            },
            {
              "fixed": "3.12.14"
            },
            {
              "introduced": "3.13.0"
            },
            {
              "fixed": "3.13.15"
            },
            {
              "introduced": "3.14.0"
            },
            {
              "fixed": "3.14.7"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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",
          "type": "CVSS_V4"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-15308"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "The incremental HTML parser (html.parser.HTMLParser) allows for CPU\ndenial-of-service through repeated unterminated markup declarations when\nprocessing uncontrolled data.",
  "id": "BIT-libpython-2026-15308",
  "modified": "2026-08-19T12:00:51.730Z",
  "published": "2026-08-19T11:37:41.302Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/09/4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/1e7956f1a722df9aabc509c30f8fbdc3a2b4fdc7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969ced"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/c2390b9376e35a701ed3acc597b8fc87546c9b00"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bd"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/issues/153030"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/pull/153031"
    },
    {
      "type": "WEB",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15308"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Incremental HTMLParser feed() allows CPU-exhaustion DoS via repeated unterminated markup declarations"
}



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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.

Sightings

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