{"id":"ALPINE-CVE-2021-31566","details":"An improper link resolution flaw can occur while extracting an archive leading to changing modes, times, access control lists, and flags of a file outside of the archive. An attacker may provide a malicious archive to a victim user, who would trigger this flaw when trying to extract the archive. A local attacker may use this flaw to gain more privileges in a system.","modified":"2026-03-09T01:22:45.521761Z","published":"2022-08-23T16:15:09.337Z","upstream":["CVE-2021-31566"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-31566"}],"affected":[{"package":{"name":"libarchive","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/libarchive?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.3-r0"}]}],"versions":["2.8.4-r0","2.8.4-r1","2.8.4-r2","2.8.5-r0","3.0.2-r0","3.0.3-r0","3.0.4-r0","3.1.2-r0","3.1.2-r1","3.1.2-r2","3.2.0-r0","3.2.1-r0","3.2.1-r1","3.2.2-r0","3.2.2-r1","3.3.1-r0","3.3.1-r1","3.3.2-r0","3.3.2-r1","3.3.2-r2","3.3.2-r3","3.3.2-r4","3.3.3-r0","3.4.0-r0","3.4.1-r0","3.4.2-r0","3.4.3-r0","3.5.0-r0","3.5.1-r0","3.5.2-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-31566.json"}},{"package":{"name":"libarchive","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/libarchive?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.3-r0"}]}],"versions":["2.8.4-r0","2.8.4-r1","2.8.4-r2","2.8.5-r0","3.0.2-r0","3.0.3-r0","3.0.4-r0","3.1.2-r0","3.1.2-r1","3.1.2-r2","3.2.0-r0","3.2.1-r0","3.2.1-r1","3.2.2-r0","3.2.2-r1","3.3.1-r0","3.3.1-r1","3.3.2-r0","3.3.2-r1","3.3.2-r2","3.3.2-r3","3.3.2-r4","3.3.3-r0","3.4.0-r0","3.4.1-r0","3.4.2-r0","3.4.3-r0","3.5.0-r0","3.5.1-r0","3.5.2-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-31566.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}