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CVE-2026-4224

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:dbf32f49c83f749c51ddfefe83e59a8e60353a2cbf3de9c792c6968ba5b2357b
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":"3.13.13","status":"affected","version":"0","versionType":"python"},{"lessThan":"3.14.4","status":"affected","version":"3.14.0","versionType":"python"},{"lessThan":"3.15.0a8","status":"affected","version":"3.15.0a1","versionType":"python"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /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,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","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:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-674","description":"CWE-674 Uncontrolled Recursion","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

9 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/03/16/4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/adp/1/references/0
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/cna/references/4
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/cna/references/6
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/cna/references/7
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/cna/references/5
{"tags":["patch"],"url":"https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/cna/references/0
{"tags":["issue-tracking"],"url":"https://github.com/python/cpython/issues/145986"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/cna/references/2
{"tags":["patch"],"url":"https://github.com/python/cpython/pull/145987"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/cna/references/3
{"tags":["vendor-advisory"],"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:aebdb899e276d19b40b4e89347ffe17aa6b7ebe7a61a7ad4b7fe17c78b8a34c6 · sha256:46a92baf5edf40b1… · /containers/cna/references/1

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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