{"id":"USN-7398-1","summary":"libtar vulnerabilities","details":"It was discovered that libtar may perform out-of-bounds reads when\nprocessing specially crafted tar files. An attacker could possibly use\nthis issue to cause libtar to crash, resulting in a denial of service,\nor execute arbitrary code. (CVE-2021-33643, CVE-2021-33644)\n\nIt was discovered that libtar contained a memory leak due to failing\nto free a variable, causing performance degradation. An attacker\ncould possibly use this issue to cause libtar to crash, resulting in a\ndenial of service. (CVE-2021-33645, CVE-2021-33646)\n","modified":"2026-06-25T13:33:10.226249299Z","published":"2025-03-31T15:25:54Z","related":["UBUNTU-CVE-2021-33643","UBUNTU-CVE-2021-33644","UBUNTU-CVE-2021-33645","UBUNTU-CVE-2021-33646"],"upstream":["CVE-2021-33643","CVE-2021-33644","CVE-2021-33645","CVE-2021-33646","UBUNTU-CVE-2021-33643","UBUNTU-CVE-2021-33644","UBUNTU-CVE-2021-33645","UBUNTU-CVE-2021-33646"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7398-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33643"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33644"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33645"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-33646"}],"affected":[{"package":{"name":"libtar","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libtar?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.20-4ubuntu0.1~esm1"}]}],"versions":["1.2.20-4"],"ecosystem_specific":{"binaries":[{"binary_name":"libtar0","binary_version":"1.2.20-4ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7398-1.json","cves_map":{"cves":[{"id":"CVE-2021-33643","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-33644"},{"id":"CVE-2021-33645","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]},{"id":"CVE-2021-33646","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"low"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"libtar","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libtar?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.20-7ubuntu0.1~esm1"}]}],"versions":["1.2.20-7"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: 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subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"id":"CVE-2021-33643","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-33644"},{"id":"CVE-2021-33645","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]},{"id":"CVE-2021-33646","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"low"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7398-1.json"}},{"package":{"name":"libtar","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libtar?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.20-8ubuntu0.22.04.1"}]}],"versions":["1.2.20-8"],"ecosystem_specific":{"availability":"No 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