CVE-2026-11940

{"id": "CVE-2026-11940", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-11940", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-23T17:57:25.652265Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "cna@python.org", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.8, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cna@python.org", "affectedData": [{"repo": "https://github.com/python/cpython", "vendor": "Python Software Foundation", "product": "CPython", "versions": [{"status": "affected", "version": "0", "lessThan": "3.10.21", "versionType": "python"}, {"status": "affected", "version": "3.11.0", "lessThan": "3.11.16", "versionType": "python"}, {"status": "affected", "version": "3.12.0", "lessThan": "3.12.14", "versionType": "python"}, {"status": "affected", "version": "3.13.0", "lessThan": "3.13.15", "versionType": "python"}, {"status": "affected", "version": "3.14.0", "lessThan": "3.14.7", "versionType": "python"}, {"status": "affected", "version": "3.15.0a1", "lessThan": "3.15.0b4", "versionType": "python"}], "defaultStatus": "unaffected"}]}], "published": "2026-06-23T17:16:40.847", "references": [{"url": "https://github.com/python/cpython/commit/0f852b3f07dd8e71e40326a51c02afbf16a42cc5", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/27dd970bf6b17ebca7c8ed486a40ab043ed7af8f", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/672825e2f36a57e173959b0d9d409d4560dab8df", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/771d12dda5140313db0ac550292987975651bbde", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/79c06bd5c6afa3c440d50faf7ee1b147c8832b4c", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/be13e86f6b9788a6f4d0419dffef72cbae5865c9", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/commit/e5fdbd8d5aa923bd9111b112ea73bd6ec7c47877", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/issues/151558", "source": "cna@python.org"}, {"url": "https://github.com/python/cpython/pull/151559", "source": "cna@python.org"}, {"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/LD6QIISNQFQYOIEPJNEUIPV7S3V76FZH/", "source": "cna@python.org"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "cna@python.org", "description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-59"}]}], "descriptions": [{"lang": "en", "value": "tarfile.extractall() with the 'data' or 'tar'\n filter could be bypassed by a crafted archive where a hardlink \nreferences a symlink stored at a deeper name than the hardlink itself.\u00a0 \nThe extraction fallback validated the symlink at it's archived location \nbut recreated it at the hardlink's shallower\npath, letting a relative\n target the filter judged contained escape the destination directory.\u00a0 \nThis allowed a malicious tar archive to create a symlink pointing \noutside the destination, enabling out-of-destination file reads or \nwrites. This was an incomplete fix of CVE-2025-4330."}, {"lang": "es", "value": "\u201ctarfile.extractall()\u201d con el filtro \u2019data\u2019 o \u2019tar\u2019 podr\u00eda ser eludido por un archivo especialmente dise\u00f1ado donde un enlace duro hace referencia a un enlace simb\u00f3lico almacenado en una ruta m\u00e1s profunda que el propio enlace duro. El mecanismo de reserva de extracci\u00f3n valid\u00f3 el enlace simb\u00f3lico en su ubicaci\u00f3n archivada pero lo recre\u00f3 en la ruta menos profunda del enlace duro, permitiendo que un objetivo relativo que el filtro juzg\u00f3 contenido escapara del directorio de destino. Esto permiti\u00f3 que un archivo tar malicioso creara un enlace simb\u00f3lico apuntando fuera del destino, habilitando lecturas o escrituras de archivos fuera del destino. Esta fue una correcci\u00f3n incompleta de CVE-2025-4330."}], "lastModified": "2026-10-26T11:10:00.157", "sourceIdentifier": "cna@python.org"}