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: 2026-07-31 14:01

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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-17 13:58 UTC

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

PSF CNA under the mitre root

CNA scorecard B 80/100 over 26 records in the last 180 days details

References

10 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

1 product

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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                "id": "CVE-2025-6069",
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                  },
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                "timestamp": "2025-06-17T13:58:28.646020Z",
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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.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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