Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2025-08-11 15:33

Modified

2025-10-10 09:07

Summary

HTMLParser quadratic complexity when processing malformed inputs

Details

The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "libpython",
        "purl": "pkg:bitnami/libpython"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.9.24"
            },
            {
              "introduced": "3.10.0"
            },
            {
              "fixed": "3.10.19"
            },
            {
              "introduced": "3.11.0"
            },
            {
              "fixed": "3.11.14"
            },
            {
              "introduced": "3.12.0"
            },
            {
              "fixed": "3.12.12"
            },
            {
              "introduced": "3.13.0"
            },
            {
              "fixed": "3.13.6"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-6069"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.",
  "id": "BIT-libpython-2025-6069",
  "modified": "2025-10-10T09:07:15.482Z",
  "published": "2025-08-11T15:33:31.541Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/4455cbabf991e202185a25a631af206f60bbc949"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/6eb6c5dbfb528bd07d77b60fd71fd05d81d45c41"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/8d1b3dfa09135affbbf27fb8babcf3c11415df49"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/ab0893fd5c579d9cea30841680e6d35fc478afb5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/d851f8e258c7328814943e923a7df81bca15df4b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/f3c6f882cddc8dc30320d2e73edf019e201394fc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/fdc9d214c01cb4588f540cfa03726bbf2a33fc15"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/issues/135462"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/pull/135464"
    },
    {
      "type": "WEB",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/K5PIYLR6EP3WR7ZOKKYQUWEDNQVUXOYM/"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-6069"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "HTMLParser quadratic complexity when processing malformed inputs"
}

CVE-2025-6069 (GCVE-0-2025-6069)

Vulnerability from cvelistv5 – Published: 2025-06-17 13:39 – Updated: 2025-10-09 18:37

Title

HTMLParser quadratic complexity when processing malformed inputs

Summary

The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

PSF

References

URL

Tags

	https://github.com/python/cpython/issues/135462	issue-tracking
	https://github.com/python/cpython/pull/135464	patch
	https://github.com/python/cpython/commit/4455cbab…	patch
	https://github.com/python/cpython/commit/6eb6c5db…	patch
	https://github.com/python/cpython/commit/d851f8e2…	patch
	https://mail.python.org/archives/list/security-an…	vendor-advisory
	https://github.com/python/cpython/commit/8d1b3dfa…	patch
	https://github.com/python/cpython/commit/ab0893fd…	patch
	https://github.com/python/cpython/commit/f3c6f882…	patch
	https://github.com/python/cpython/commit/fdc9d214…	patch

Impacted products

	Vendor	Product	Version
	Python Software Foundation	CPython	Affected: 0 , < 3.9.24 (python) Affected: 3.10.0 , < 3.10.19 (python) Affected: 3.11.0 , < 3.11.14 (python) Affected: 3.12.0 , < 3.12.12 (python) Affected: 3.13.0 , < 3.13.6 (python) Affected: 3.14.0a1 , < 3.14.0b3 (python)

Credits

Serhiy Storchaka Jake Howard sw0rd1ight

Show details on NVD website

JSON

To clipboard

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      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-6069",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-06-17T13:58:28.646020Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2025-06-17T13:58:41.637Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "html.parser"
          ],
          "product": "CPython",
          "repo": "https://github.com/python/cpython",
          "vendor": "Python Software Foundation",
          "versions": [
            {
              "lessThan": "3.9.24",
              "status": "affected",
              "version": "0",
              "versionType": "python"
            },
            {
              "lessThan": "3.10.19",
              "status": "affected",
              "version": "3.10.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.11.14",
              "status": "affected",
              "version": "3.11.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.12.12",
              "status": "affected",
              "version": "3.12.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.13.6",
              "status": "affected",
              "version": "3.13.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.14.0b3",
              "status": "affected",
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            }
          ]
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      ],
      "credits": [
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          "type": "remediation developer",
          "value": "Serhiy Storchaka"
        },
        {
          "lang": "en",
          "type": "reporter",
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        },
        {
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      ],
      "descriptions": [
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          ],
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2025-10-09T18:37:55.979Z",
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          "tags": [
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          "url": "https://github.com/python/cpython/issues/135462"
        },
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          "tags": [
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          ],
          "url": "https://github.com/python/cpython/pull/135464"
        },
        {
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        {
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      },
      "title": "HTMLParser quadratic complexity when processing malformed inputs",
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    "datePublished": "2025-06-17T13:39:46.058Z",
    "dateReserved": "2025-06-13T14:05:15.473Z",
    "dateUpdated": "2025-10-09T18:37:55.979Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2025-6069 (GCVE-0-2025-6069)

Tags

Sightings

Nomenclature