{"id":"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":"2026-04-16T04:31:48.630474433Z","published":"2022-08-23T16:15:09.337Z","related":["ALSA-2022:0892","SUSE-SU-2022:3935-1","SUSE-SU-2022:3936-1","openSUSE-SU-2024:11894-1"],"references":[{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/11/msg00030.html"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2021-31566"},{"type":"FIX","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2024237"},{"type":"FIX","url":"https://github.com/libarchive/libarchive/commit/b41daecb5ccb4c8e3b2c53fd6147109fc12c3043"},{"type":"FIX","url":"https://github.com/libarchive/libarchive/issues/1566"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/libarchive/libarchive","events":[{"introduced":"0"},{"fixed":"1b2c437b99b361c7692538fa373e99955e9b93ae"},{"fixed":"b41daecb5ccb4c8e3b2c53fd6147109fc12c3043"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"3.5.2"}]}}],"versions":["v3.0.0a","v3.0.1b","v3.1.900a","v3.2.0","v3.2.1","v3.2.2","v3.3.0","v3.3.1","v3.3.2","v3.3.3","v3.4.0","v3.4.1","v3.4.2","v3.4.3","v3.5.0","v3.5.1"],"database_specific":{"vanir_signatures_modified":"2026-04-11T17:12:28Z","unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"35"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.6"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.6"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.6"}]},{"events":[{"introduced":"0"},{"last_affected":"8.6"}]},{"events":[{"introduced":"0"},{"last_affected":"8.6"}]},{"events":[{"introduced":"0"},{"last_affected":"8.6"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]},{"events":[{"introduced":"8.2.0"},{"fixed":"8.2.12"}]},{"events":[{"introduced":"9.0.0"},{"fixed":"9.0.6"}]},{"events":[{"introduced":"0"},{"last_affected":"9.1.0"}]}],"vanir_signatures":[{"signature_type":"Function","signature_version":"v1","id":"CVE-2021-31566-0834228a","target":{"function":"new_fixup","file":"libarchive/archive_write_disk_posix.c"},"deprecated":false,"digest":{"function_hash":"320885234252780684570698584660020445109","length":392},"source":"https://github.com/libarchive/libarchive/commit/b41daecb5ccb4c8e3b2c53fd6147109fc12c3043"},{"signature_type":"Function","signature_version":"v1","id":"CVE-2021-31566-ac5c5a7f","target":{"function":"_archive_write_disk_close","file":"libarchive/archive_write_disk_posix.c"},"deprecated":false,"digest":{"function_hash":"110734215287798123614942951414182550419","length":1519},"source":"https://github.com/libarchive/libarchive/commit/b41daecb5ccb4c8e3b2c53fd6147109fc12c3043"},{"signature_type":"Line","signature_version":"v1","id":"CVE-2021-31566-d6100c6d","target":{"file":"libarchive/archive_write_disk_posix.c"},"deprecated":false,"digest":{"threshold":0.9,"line_hashes":["334213001812460528018391827159886250604","298298676331893685508912404895218376082","281934148289165203262543037398505981918","133516452297774702506059862221571155387","255221266610567971253350916651381886473","170682487718179720080081239390752149260","170025671853692686754571705056591065980","45037131218959646499624916514381153602","186193754164664539686045318506423310731","225543418414766849505237414068380309124","86909181518846551630439248081499842741","204079521770618757456484582354817443455","186196365260791091821237758044867926710","177454630852752040839969091402436254366","19420843327646963772774605998605845839","293067094968881452369372668079840711572","203792904399839432760890263818080987312","5073500280348788259073985801637204843","56277685507538684435295851773380652368","144927451397420683091458932258143307900"]},"source":"https://github.com/libarchive/libarchive/commit/b41daecb5ccb4c8e3b2c53fd6147109fc12c3043"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-31566.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}