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CVE-2026-3298

The method "sock_recvfrom_into()" of "asyncio.ProacterEventLoop" (Windows only) was missing a boundary check for the data buffer when using nbytes parameter. This allowed for an out-of-bounds buffer write if data was larger than the buffer size. Non-Windows platforms are not affected.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:456c3dbe5702280d2d3fd29f839584f9aabd197c6c7a4539d1c8bec9236134f2
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"CPython","repo":"https://github.com/python/cpython","vendor":"Python Software Foundation","versions":[{"lessThan":"3.13.14","status":"affected","version":"0","versionType":"python"},{"lessThan":"3.14.5rc1","status":"affected","version":"3.14.0a1","versionType":"python"},{"lessThan":"3.15.0b1","status":"affected","version":"3.15.0a1","versionType":"python"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8e197dfea963841306db3982a6d447b2d75d85970250187d6bf0adc6701c879a · sha256:d4c9a9937b7b0eae… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.8,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","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:L/VI:L/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8e197dfea963841306db3982a6d447b2d75d85970250187d6bf0adc6701c879a · sha256:d4c9a9937b7b0eae… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-787","description":"CWE-787 Out-of-bounds write","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8e197dfea963841306db3982a6d447b2d75d85970250187d6bf0adc6701c879a · sha256:d4c9a9937b7b0eae… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/1274766d3c29007ab77245a72abbf8dce2a9db4d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8e197dfea963841306db3982a6d447b2d75d85970250187d6bf0adc6701c879a · sha256:d4c9a9937b7b0eae… · /containers/cna/references/3
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/27522b7d6e6588f03e61099dd858cd5a9314e2f2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8e197dfea963841306db3982a6d447b2d75d85970250187d6bf0adc6701c879a · sha256:d4c9a9937b7b0eae… · /containers/cna/references/4
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/95633d2aad4721e25e4dfd9f43dfb6e1edcbd741"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8e197dfea963841306db3982a6d447b2d75d85970250187d6bf0adc6701c879a · sha256:d4c9a9937b7b0eae… · /containers/cna/references/5
{"tags":["issue-tracking"],"url":"https://github.com/python/cpython/issues/148808"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8e197dfea963841306db3982a6d447b2d75d85970250187d6bf0adc6701c879a · sha256:d4c9a9937b7b0eae… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/python/cpython/pull/148809"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8e197dfea963841306db3982a6d447b2d75d85970250187d6bf0adc6701c879a · sha256:d4c9a9937b7b0eae… · /containers/cna/references/0
{"tags":["vendor-advisory"],"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/KWTPIQBOOOUNQP7UFSLBI437NJDFLA3F/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8e197dfea963841306db3982a6d447b2d75d85970250187d6bf0adc6701c879a · sha256:d4c9a9937b7b0eae… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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