{"id":"UBUNTU-CVE-2026-73030","details":"unearth through 0.18.2, fixed in commit 6c78164, contains a path traversal vulnerability in the is_within_directory function that fails to normalize paths before validation, allowing ../ sequences to bypass directory containment checks. Attackers can supply malicious tar archives with symlink members or traversal sequences to write files to arbitrary filesystem locations accessible to the process.","modified":"2026-10-01T00:22:01.646738540Z","published":"2026-08-10T21:17:00Z","upstream":["CVE-2026-73030"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-73030"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-73030"},{"type":"REPORT","url":"https://github.com/frostming/unearth/issues/180"},{"type":"REPORT","url":"https://github.com/frostming/unearth/pull/181"}],"affected":[{"package":{"name":"unearth","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/unearth?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.2+ds1-1","0.11.0+ds-1","0.12.1+ds-1","0.14.0+ds-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-unearth","binary_version":"0.14.0+ds-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73030.json"}},{"package":{"name":"unearth","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/unearth?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.17.5-1","0.18.1-1","0.18.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-unearth","binary_version":"0.18.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73030.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}