{"id":"CVE-2026-11940","summary":"tarfile extraction filter bypass allows escaping the destination directory","details":"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.  \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.  \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.","aliases":["BIT-libpython-2026-11940","BIT-python-2026-11940","BIT-python-min-2026-11940","PSF-2026-30"],"modified":"2026-07-08T08:04:54.586602323Z","published":"2026-06-23T16:04:17.321Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11940.json","cna_assigner":"PSF","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"fixed":"3.15.0"}]}],"cwe_ids":["CWE-22","CWE-59"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11940.json"},{"type":"ADVISORY","url":"https://mail.python.org/archives/list/security-announce@python.org/thread/LD6QIISNQFQYOIEPJNEUIPV7S3V76FZH/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11940"},{"type":"REPORT","url":"https://github.com/python/cpython/issues/151558"},{"type":"FIX","url":"https://github.com/python/cpython/commit/27dd970bf6b17ebca7c8ed486a40ab043ed7af8f"},{"type":"FIX","url":"https://github.com/python/cpython/commit/672825e2f36a57e173959b0d9d409d4560dab8df"},{"type":"FIX","url":"https://github.com/python/cpython/commit/771d12dda5140313db0ac550292987975651bbde"},{"type":"FIX","url":"https://github.com/python/cpython/commit/79c06bd5c6afa3c440d50faf7ee1b147c8832b4c"},{"type":"FIX","url":"https://github.com/python/cpython/commit/be13e86f6b9788a6f4d0419dffef72cbae5865c9"},{"type":"FIX","url":"https://github.com/python/cpython/pull/151559"},{"type":"PACKAGE","url":"https://github.com/python/cpython"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python/cpython","events":[{"introduced":"0"},{"fixed":"27dd970bf6b17ebca7c8ed486a40ab043ed7af8f"},{"fixed":"672825e2f36a57e173959b0d9d409d4560dab8df"},{"fixed":"771d12dda5140313db0ac550292987975651bbde"},{"fixed":"79c06bd5c6afa3c440d50faf7ee1b147c8832b4c"},{"fixed":"be13e86f6b9788a6f4d0419dffef72cbae5865c9"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v3.15.0b3","v3.13.14","v3.14.6","v3.15.0b2","v3.14.5","v3.15.0b1","v3.14.5rc1","v3.13.13","v3.14.4","v3.15.0a8","v3.15.0a7","v3.11.15","v3.15.0a6","v3.13.12","v3.14.3","v3.15.0a5","v3.15.0a4","v3.15.0a3","v3.14.2","v3.13.11","v3.13.10","v3.14.1","v3.15.0a2","v3.15.0a1","v3.13.8","v3.11.14","v3.14.0","v3.14.0rc3","v3.13.7","v3.14.0rc2","v3.13.6","v3.14.0rc1","v3.14.0b4","v3.14.0b3","v3.13.5","v3.13.4","v3.11.13","v3.14.0b2","v3.14.0b1","v3.13.3","v3.11.12","v3.14.0a7","v3.14.0a6","v3.14.0a5","v3.13.2","v3.14.0a4","v3.14.0a3","v3.13.1","v3.11.11","v3.14.0a2","v3.14.0a1","v3.13.0","v3.13.0rc3","v3.11.10","v3.13.0rc2","v3.13.0rc1","v3.13.0b4","v3.13.0b3","v3.13.0b2","v3.13.0b1","v3.13.0a6","v3.11.9","v3.13.0a5","v3.13.0a4","v3.11.8","v3.13.0a3","v3.11.7","v3.13.0a2","v3.13.0a1","v3.11.6","v3.11.5","v3.11.4","v3.12.0b1","v3.11.3","v3.12.0a7","v3.12.0a6","v3.11.2","v3.12.0a5","v3.12.0a4","v3.12.0a3","v3.11.1","v3.12.0a2","v3.12.0a1","v3.11.0rc2","v3.11.0rc1","v3.11.0b5","v3.11.0b4","v3.11.0b3","v3.11.0b2","v3.11.0b1","v3.11.0a7","v3.11.0a6","v3.11.0a5","v3.11.0a4","v3.11.0a3","v3.10.0a7","v3.10.0a1","v3.9.0a2","v3.7.0a2","v3.6.0b1","v3.6.0a3","v3.5.0b1","v3.5.0a4","v3.5.0a3","v3.5.0a2","v3.5.0a1","v3.4.0b3","v3.4.0b2","v3.4.0b1","v3.4.0a4","v3.4.0a3","v3.4.0a2","v3.4.0a1","v3.3.0rc3","v3.3.0rc2","v3.3.0rc1","v3.3.0b2","v3.3.0b1","v3.3.0a4","v3.3.0a3","v3.3.0a2","v3.2rc3","v3.2rc2","v3.2rc1","v3.2b2","v3.2b1","v3.2a4","v3.2a3","v3.2a2","v3.2a1","v3.1","v3.1rc2","v3.1rc1","v3.1b1","v3.1a2","v3.1a1","v3.0rc3","v3.0rc2","v3.0rc1","v3.0b3","v3.0b2","v3.0b1","v3.0a5","v3.0a4","v3.0a3","v3.0a2","v3.0a1","v2.4","v2.4c1","v2.4b2","v2.4b1","v2.4a3","v2.4a2","v2.4a1","v2.3c2","v2.3c1","v2.2a3","v2.1","v2.1c2","v2.1c1","v2.1b2","v2.1b1","v2.1a2","v2.1a1","v2.0","v2.0c1","v2.0b2","v2.0b1","v1.6a2","v1.6a1","v1.5.2","v1.5.2c1","v1.5.2b2","v1.5.2b1","v1.5.2a2","v1.5.2a1","v1.5.1","v1.5","v1.5b2","v1.5b1","v1.5a4","v1.5a3","v1.5a2","v1.5a1","v1.4","v1.4b3","v1.4b2","v1.4b1","v1.3","v1.3b1","v1.2","v1.2b4","v1.2b3","v1.2b2","v1.2b1","v1.1.1","v1.1","v1.0.2","v1.0.1","v0.9.9","v0.9.8"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11940.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}