{"id":"USN-8477-3","summary":"tar regression","details":"USN-8477-1 fixed a vulnerability in tar. That fix was incomplete and could\ncause tar to fail to extract old archives that recorded a nonzero size for\ndirectory entries, resulting in a regression.\nThis update fixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that tar incorrectly handled certain crafted archive files.\n An attacker could possibly use this to inject hidden files with\n attacker-controlled content, bypassing pre-extraction inspection mechanisms.","modified":"2026-07-22T20:59:36.420470147Z","published":"2026-07-22T15:03:31Z","related":["UBUNTU-CVE-2026-5704"],"upstream":["CVE-2026-5704","UBUNTU-CVE-2026-5704"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8477-3"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-5704"},{"type":"REPORT","url":"https://launchpad.net/bugs/2161311"}],"affected":[{"package":{"name":"tar","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tar?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.27.1-1ubuntu0.1+esm7"}]}],"versions":["1.26+dfsg-8","1.27-3","1.27-4","1.27.1-1","1.27.1-1ubuntu0.1","1.27.1-1ubuntu0.1+esm1","1.27.1-1ubuntu0.1+esm2","1.27.1-1ubuntu0.1+esm3","1.27.1-1ubuntu0.1+esm4","1.27.1-1ubuntu0.1+esm5","1.27.1-1ubuntu0.1+esm6"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"tar","binary_version":"1.27.1-1ubuntu0.1+esm7"},{"binary_name":"tar-scripts","binary_version":"1.27.1-1ubuntu0.1+esm7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8477-3.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"id":"CVE-2026-5704","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"tar","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/tar?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.28-2.1ubuntu0.2+esm6"}]}],"versions":["1.27.1-2","1.28-2ubuntu1","1.28-2.1","1.28-2.1ubuntu0.1","1.28-2.1ubuntu0.2","1.28-2.1ubuntu0.2+esm1","1.28-2.1ubuntu0.2+esm2","1.28-2.1ubuntu0.2+esm3","1.28-2.1ubuntu0.2+esm4","1.28-2.1ubuntu0.2+esm5"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_version":"1.28-2.1ubuntu0.2+esm6","binary_name":"tar"},{"binary_version":"1.28-2.1ubuntu0.2+esm6","binary_name":"tar-scripts"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2026-5704","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8477-3.json"}},{"package":{"name":"tar","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/tar?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.29b-2ubuntu0.4+esm4"}]}],"versions":["1.29b-2","1.29b-2ubuntu0.1","1.29b-2ubuntu0.2","1.29b-2ubuntu0.3","1.29b-2ubuntu0.4","1.29b-2ubuntu0.4+esm1","1.29b-2ubuntu0.4+esm2","1.29b-2ubuntu0.4+esm3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"tar","binary_version":"1.29b-2ubuntu0.4+esm4"},{"binary_name":"tar-scripts","binary_version":"1.29b-2ubuntu0.4+esm4"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-5704"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8477-3.json"}},{"package":{"name":"tar","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/tar?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.30+dfsg-7ubuntu0.20.04.4+esm3"}]}],"versions":["1.30+dfsg-6","1.30+dfsg-7","1.30+dfsg-7ubuntu0.20.04.1","1.30+dfsg-7ubuntu0.20.04.2","1.30+dfsg-7ubuntu0.20.04.3","1.30+dfsg-7ubuntu0.20.04.4","1.30+dfsg-7ubuntu0.20.04.4+esm1","1.30+dfsg-7ubuntu0.20.04.4+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.30+dfsg-7ubuntu0.20.04.4+esm3","binary_name":"tar"},{"binary_name":"tar-scripts","binary_version":"1.30+dfsg-7ubuntu0.20.04.4+esm3"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-5704"}],"ecosystem":"Ubuntu:Pro:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8477-3.json"}},{"package":{"name":"tar","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/tar?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.34+dfsg-1ubuntu0.1.22.04.6"}]}],"versions":["1.34+dfsg-1build1","1.34+dfsg-1build2","1.34+dfsg-1build3","1.34+dfsg-1ubuntu0.1.22.04.1","1.34+dfsg-1ubuntu0.1.22.04.2","1.34+dfsg-1ubuntu0.1.22.04.3","1.34+dfsg-1ubuntu0.1.22.04.4","1.34+dfsg-1ubuntu0.1.22.04.5"],"ecosystem_specific":{"binaries":[{"binary_version":"1.34+dfsg-1ubuntu0.1.22.04.6","binary_name":"tar"},{"binary_version":"1.34+dfsg-1ubuntu0.1.22.04.6","binary_name":"tar-scripts"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-5704"}],"ecosystem":"Ubuntu:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8477-3.json"}},{"package":{"name":"tar","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/tar?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.35+dfsg-3ubuntu0.4"}]}],"versions":["1.34+dfsg-1.2ubuntu1","1.34+dfsg-1.2ubuntu2","1.34+dfsg-1.3ubuntu1","1.34+dfsg-1.4","1.35+dfsg-2~build1","1.35+dfsg-2","1.35+dfsg-3","1.35+dfsg-3build1","1.35+dfsg-3ubuntu0.1","1.35+dfsg-3ubuntu0.2","1.35+dfsg-3ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.35+dfsg-3ubuntu0.4","binary_name":"tar"},{"binary_version":"1.35+dfsg-3ubuntu0.4","binary_name":"tar-scripts"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:24.04:LTS","cves":[{"id":"CVE-2026-5704","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8477-3.json"}},{"package":{"name":"tar","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/tar?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.35+dfsg-4ubuntu0.4"}]}],"versions":["1.35+dfsg-3.1build1","1.35+dfsg-3.1build2","1.35+dfsg-4","1.35+dfsg-4ubuntu0.1","1.35+dfsg-4ubuntu0.2","1.35+dfsg-4ubuntu0.3"],"ecosystem_specific":{"availability":"No subscription 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