Vulnerability-Lookup

ubuntu-cve-2024-12254

Vulnerability from osv_ubuntu

Published

2024-12-06 16:15

Modified

2026-04-22 07:47

Summary

Details

Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines() method would not "pause" writing and signal to the Protocol to drain the buffer to the wire once the write buffer reached the "high-water mark". Because of this, Protocols would not periodically drain the write buffer potentially leading to memory exhaustion. This vulnerability likely impacts a small number of users, you must be using Python 3.12.0 or later, on macOS or Linux, using the asyncio module with protocols, and using .writelines() method which had new zero-copy-on-write behavior in Python 3.12.0 and later. If not all of these factors are true then your usage of Python is unaffected.

Severity

7.5 (High)


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

8.7 (High)


                    
                      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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2024-12254	REPORT
	https://www.cve.org/CVERecord?id=CVE-2024-12254	REPORT
	https://github.com/python/cpython/pull/127656	REPORT
	https://mail.python.org/archives/list/security-an…	REPORT
	http://www.openwall.com/lists/oss-security/2024/12/06/1	REPORT
	https://ubuntu.com/security/notices/USN-7219-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "idle-python3.12",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "libpython3.12-minimal",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "libpython3.12-stdlib",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "libpython3.12-testsuite",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "libpython3.12t64",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12-examples",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12-full",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12-minimal",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12-nopie",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12-venv",
            "binary_version": "3.12.3-1ubuntu0.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "python3.12",
        "purl": "pkg:deb/ubuntu/python3.12@3.12.3-1ubuntu0.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.12.3-1ubuntu0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.12.0-1",
        "3.12.0-5",
        "3.12.0-6",
        "3.12.0-7",
        "3.12.1-2",
        "3.12.2-1",
        "3.12.2-4build3",
        "3.12.2-4build4",
        "3.12.2-5ubuntu3",
        "3.12.3-1",
        "3.12.3-1ubuntu0.1",
        "3.12.3-1ubuntu0.2",
        "3.12.3-1ubuntu0.3"
      ]
    }
  ],
  "aliases": [],
  "details": "Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines()  method would not \"pause\" writing and signal to the Protocol to drain the buffer to the wire once the write buffer reached the \"high-water mark\". Because of this, Protocols would not periodically drain the write  buffer potentially leading to memory exhaustion. This  vulnerability likely impacts a small number of users, you must be using  Python 3.12.0 or later, on macOS or Linux, using the asyncio module with protocols, and using .writelines() method which had new zero-copy-on-write behavior in Python 3.12.0 and later. If not all of these factors are true then your usage of Python is unaffected.",
  "id": "UBUNTU-CVE-2024-12254",
  "modified": "2026-04-22T07:47:57Z",
  "published": "2024-12-06T16:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2024-12254"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-12254"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/pull/127656"
    },
    {
      "type": "REPORT",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/H4O3UBAOAQQXGT4RE3E4XQYR5XLROORB/"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2024/12/06/1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7219-1"
    }
  ],
  "related": [
    "USN-7219-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2024-12254"
  ]
}

CVE-2024-12254 (GCVE-0-2024-12254)

Vulnerability from cvelistv5 – Published: 2024-12-06 15:19 – Updated: 2025-04-04 23:03

Title

Unbounded memory buffering in SelectorSocketTransport.writelines()

Summary

Severity

8.7 (High)


                        
                          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

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

PSF

References

8 references

URL	Tags
https://github.com/python/cpython/issues/127655	issue-tracking
https://github.com/python/cpython/pull/127656	patch
https://mail.python.org/archives/list/security-an…	vendor-advisory
https://github.com/python/cpython/commit/71e8429a…	patch
https://github.com/python/cpython/commit/9aa0deb2…	patch
https://github.com/python/cpython/commit/e991ac8f…	patch
http://www.openwall.com/lists/oss-security/2024/12/06/1
https://security.netapp.com/advisory/ntap-2025040…

Impacted products

2 products

Vendor	Product	Version
Python Software Foundation	CPython	Affected: 3.12.0 , < 3.12.9 (python) Affected: 3.13.0 , < 3.13.2 (python) Affected: 3.14.0a1 , < 3.14.0a3 (python)
python_software_foundation	cpython	Affected: 3.12.0 , < 3.14.0a1 (python) cpe:2.3:a:python_software_foundation:cpython::::::::

Credits

J. Nick Koston Seth Larson

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:python_software_foundation:cpython:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "cpython",
            "vendor": "python_software_foundation",
            "versions": [
              {
                "lessThan": "3.14.0a1",
                "status": "affected",
                "version": "3.12.0",
                "versionType": "python"
              }
            ]
          }
        ],
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-12254",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-12-06T15:35:11.234951Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-770",
                "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-02-05T16:54:28.955Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-04-04T23:03:00.653Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2024/12/06/1"
          },
          {
            "url": "https://security.netapp.com/advisory/ntap-20250404-0010/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "asyncio"
          ],
          "platforms": [
            "MacOS",
            "Linux"
          ],
          "product": "CPython",
          "repo": "https://github.com/python/cpython",
          "vendor": "Python Software Foundation",
          "versions": [
            {
              "lessThan": "3.12.9",
              "status": "affected",
              "version": "3.12.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.13.2",
              "status": "affected",
              "version": "3.13.0",
              "versionType": "python"
            },
            {
              "lessThan": "3.14.0a3",
              "status": "affected",
              "version": "3.14.0a1",
              "versionType": "python"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "J. Nick Koston"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Seth Larson"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cdiv\u003eStarting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines()\n method would not \"pause\" writing and signal to the Protocol to drain \nthe buffer to the wire once the write buffer reached the \"high-water \nmark\". Because of this, Protocols would not periodically drain the write\n buffer potentially leading to memory exhaustion.\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eThis\n vulnerability likely impacts a small number of users, you must be using\n Python 3.12.0 or later, on macOS or Linux, using the asyncio module \nwith protocols, and using .writelines() method which had new \nzero-copy-on-write behavior in Python 3.12.0 and later. If not all of \nthese factors are true then your usage of Python is unaffected.\u003c/div\u003e\u003cbr\u003e"
            }
          ],
          "value": "Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines()\n method would not \"pause\" writing and signal to the Protocol to drain \nthe buffer to the wire once the write buffer reached the \"high-water \nmark\". Because of this, Protocols would not periodically drain the write\n buffer potentially leading to memory exhaustion.\n\n\n\n\n\nThis\n vulnerability likely impacts a small number of users, you must be using\n Python 3.12.0 or later, on macOS or Linux, using the asyncio module \nwith protocols, and using .writelines() method which had new \nzero-copy-on-write behavior in Python 3.12.0 and later. If not all of \nthese factors are true then your usage of Python is unaffected."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400 Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-02-04T20:38:34.082Z",
        "orgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "shortName": "PSF"
      },
      "references": [
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/python/cpython/issues/127655"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/pull/127656"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/H4O3UBAOAQQXGT4RE3E4XQYR5XLROORB/"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/71e8429ac8e2adc10084ab5ec29a62f4b6671a82"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/9aa0deb2eef2655a1029ba228527b152353135b5"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/python/cpython/commit/e991ac8f2037d78140e417cc9a9486223eb3e786"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Unbounded memory buffering in SelectorSocketTransport.writelines()",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
    "assignerShortName": "PSF",
    "cveId": "CVE-2024-12254",
    "datePublished": "2024-12-06T15:19:41.576Z",
    "dateReserved": "2024-12-05T16:17:55.154Z",
    "dateUpdated": "2025-04-04T23:03:00.653Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

usn-7219-1

Vulnerability from osv_ubuntu

Published

2025-01-20 15:13

Modified

2026-04-22 07:37

Summary

python3.12 vulnerability

Details

It was discovered that Python incorrectly handled asyncio write buffers. A remote attacker could possibly use this issue to cause Python to consume memory, leading to a denial of service.

References

URL

Type

	https://ubuntu.com/security/notices/USN-7219-1	ADVISORY
	https://ubuntu.com/security/CVE-2024-12254	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2024-12254",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "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",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "idle-python3.12",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "libpython3.12-minimal",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "libpython3.12-stdlib",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "libpython3.12-testsuite",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "libpython3.12t64",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12-examples",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12-full",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12-minimal",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12-nopie",
            "binary_version": "3.12.3-1ubuntu0.4"
          },
          {
            "binary_name": "python3.12-venv",
            "binary_version": "3.12.3-1ubuntu0.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "python3.12",
        "purl": "pkg:deb/ubuntu/python3.12@3.12.3-1ubuntu0.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.12.3-1ubuntu0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.12.0-1",
        "3.12.0-5",
        "3.12.0-6",
        "3.12.0-7",
        "3.12.1-2",
        "3.12.2-1",
        "3.12.2-4build3",
        "3.12.2-4build4",
        "3.12.2-5ubuntu3",
        "3.12.3-1",
        "3.12.3-1ubuntu0.1",
        "3.12.3-1ubuntu0.2",
        "3.12.3-1ubuntu0.3"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Python incorrectly handled asyncio write buffers. A\nremote attacker could possibly use this issue to cause Python to consume\nmemory, leading to a denial of service.\n",
  "id": "USN-7219-1",
  "modified": "2026-04-22T07:37:15Z",
  "published": "2025-01-20T15:13:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7219-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2024-12254"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "python3.12 vulnerability",
  "upstream": [
    "UBUNTU-CVE-2024-12254"
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

ubuntu-cve-2024-12254

Vulnerability from osv_ubuntu

CVE-2024-12254 (GCVE-0-2024-12254)

usn-7219-1

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature