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    2 vulnerabilities found for cpython by python_software_foundation

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

    Vulnerability from nvd – Published: 2024-12-06 15:19 – Updated: 2026-07-31 14:08
    VLAI
    Title
    Unbounded memory buffering in SelectorSocketTransport.writelines()
    Summary
    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
    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 · CISA-ADP (v2.0.3)
    Decision recorded 2024-12-06 15:35 UTC
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    Assigner
    References
    Impacted products
    Vendor Product Version
    Python Software Foundation CPython Affected: 0 , < 3.12.9 (python)
    Affected: 3.13.0 , < 3.13.2 (python)
    Affected: 3.14.0a1 , < 3.14.0a3 (python)
    		Create a notification for this product.
    python_software_foundation cpython Affected: 3.12.0 , < 3.14.0a1 (python)
        cpe:2.3:a:python_software_foundation:cpython:*:*:*:*:*:*:*:*
    		Create a notification for this product.
    Credits
    J. Nick Koston Seth Larson
    Show details on NVD website
    To clipboard 

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

    Vulnerability from cvelistv5 – Published: 2024-12-06 15:19 – Updated: 2026-07-31 14:08
    VLAI
    Title
    Unbounded memory buffering in SelectorSocketTransport.writelines()
    Summary
    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
    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 · CISA-ADP (v2.0.3)
    Decision recorded 2024-12-06 15:35 UTC
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    Assigner
    References
    Impacted products
    Vendor Product Version
    Python Software Foundation CPython Affected: 0 , < 3.12.9 (python)
    Affected: 3.13.0 , < 3.13.2 (python)
    Affected: 3.14.0a1 , < 3.14.0a3 (python)
    		Create a notification for this product.
    python_software_foundation cpython Affected: 3.12.0 , < 3.14.0a1 (python)
        cpe:2.3:a:python_software_foundation:cpython:*:*:*:*:*:*:*:*
    		Create a notification for this product.
    Credits
    J. Nick Koston Seth Larson
    Show details on NVD website
    To clipboard 

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