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

Vulnerability from cvelistv5 – Published: 2024-12-06 15:19 – Updated: 2025-04-04 23:03
VLAI?
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
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
PSF
References
Impacted 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)
Create a notification for this product.
Credits
J. Nick Koston Seth Larson
Show details on NVD website
To clipboard 

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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.\", \"supportingMedia\": [{\"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\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400 Uncontrolled Resource Consumption\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770 Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"28c92f92-d60d-412d-b760-e73465c3df22\", \"shortName\": \"PSF\", \"dateUpdated\": \"2025-02-04T20:38:34.082Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-12254\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-04-04T23:03:00.653Z\", \"dateReserved\": \"2024-12-05T16:17:55.154Z\", \"assignerOrgId\": \"28c92f92-d60d-412d-b760-e73465c3df22\", \"datePublished\": \"2024-12-06T15:19:41.576Z\", \"assignerShortName\": \"PSF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.