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CVE-2026-3276

unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating Canonical Combining Class values. This affects all normalization forms.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d0394d66b29078c32d86a941f822f08fa3d56de804956ef6219fe126e72d6d7e
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":"3.14.6","status":"affected","version":"3.14.0","versionType":"python"},{"lessThan":"3.15.0b2","status":"affected","version":"3.15.0a1","versionType":"python"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","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:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpac…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-407","description":"CWE-407","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/problemTypes/0/descriptions/0

Source references

9 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/06/03/15"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/adp/1/references/0
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/6b505d1f41f8f3ea0fe5a4786d3a8fff1875cfc0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/references/3
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/90748760d38ca3ac5fc6788a69becab905c95598"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/references/7
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/991224b1e8311c85f198f6dd8208bf8cff7fc26f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/references/4
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/ba785b88add96acbf403d65cb157fb2743a33a32"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/references/5
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/c5512bd7c1dc28055660565275012766941d3066"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/references/6
{"tags":["issue-tracking"],"url":"https://github.com/python/cpython/issues/149079"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/references/2
{"tags":["patch"],"url":"https://github.com/python/cpython/pull/149080"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/references/1
{"tags":["vendor-advisory"],"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/PP5HB4K7727OBBM76KA2ILID76K3OZGZ/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:440aa7cc130e58d14ce621fc5457bedf07c6401a4f05d711b65898bc0d7fa214 · sha256:00d1deeb0d6f592a… · /containers/cna/references/0

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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