{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-11940", "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22", "state": "PUBLISHED", "assignerShortName": "PSF", "dateReserved": "2026-06-10T19:50:59.923Z", "datePublished": "2026-06-23T16:04:17.321Z", "dateUpdated": "2026-06-23T17:57:32.525Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "CPython", "repo": "https://github.com/python/cpython", "vendor": "Python Software Foundation", "versions": [{"version": "0", "lessThan": "3.15.0", "status": "affected", "versionType": "python"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Haruki Oyama (https://github.com/harukioya)"}, {"lang": "en", "type": "coordinator", "value": "Stan Ulbrych (https://github.com/StanFromIreland)"}, {"lang": "en", "type": "remediation reviewer", "value": "Petr Viktorin (https://github.com/encukou)"}], "descriptions": [{"lang": "en", "supportingMedia": [{"type": "text/html", "value": "<span>tarfile.extractall()</span> with the <span>'data'</span> or <span>'tar'</span>\n filter could be bypassed by a crafted archive where a hardlink \nreferences a symlink stored at a deeper name than the hardlink itself.&nbsp; \nThe extraction fallback validated the symlink at it's archived location \nbut recreated it at the hardlink's shallower<br>path, letting a relative\n target the filter judged contained escape the destination directory.&nbsp; \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."}], "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."}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 7.8, "baseSeverity": "HIGH", "exploitMaturity": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-22", "description": "CWE-22", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-59", "description": "CWE-59", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "28c92f92-d60d-412d-b760-e73465c3df22", "shortName": "PSF", "dateUpdated": "2026-06-23T17:56:09.397Z"}, "references": [{"tags": ["patch"], "url": "https://github.com/python/cpython/pull/151559"}, {"tags": ["vendor-advisory"], "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/LD6QIISNQFQYOIEPJNEUIPV7S3V76FZH/"}, {"tags": ["issue-tracking"], "url": "https://github.com/python/cpython/issues/151558"}, {"tags": ["patch"], "url": "https://github.com/python/cpython/commit/27dd970bf6b17ebca7c8ed486a40ab043ed7af8f"}, {"tags": ["patch"], "url": "https://github.com/python/cpython/commit/672825e2f36a57e173959b0d9d409d4560dab8df"}, {"tags": ["patch"], "url": "https://github.com/python/cpython/commit/771d12dda5140313db0ac550292987975651bbde"}, {"tags": ["patch"], "url": "https://github.com/python/cpython/commit/79c06bd5c6afa3c440d50faf7ee1b147c8832b4c"}], "source": {"discovery": "UNKNOWN"}, "title": "tarfile extraction filter bypass allows escaping the destination directory", "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-23T17:57:25.652265Z", "id": "CVE-2026-11940", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-23T17:57:32.525Z"}}]}}

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