{"id":"ALPINE-CVE-2026-34743","details":"XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.","modified":"2026-04-29T06:33:53.540237Z","published":"2026-04-02T19:21:33.187Z","upstream":["CVE-2026-34743"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2026-34743"}],"affected":[{"package":{"name":"xz","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/xz?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.3-r0"}]}],"versions":["5.0.0-r0","5.0.1-r0","5.0.2-r0","5.0.3-r0","5.0.3-r1","5.0.4-r0","5.0.4-r1","5.0.5-r0","5.0.6-r0","5.0.7-r0","5.2.0-r0","5.2.1-r0","5.2.2-r0","5.2.2-r1","5.2.3-r0","5.2.3-r1","5.2.4-r0","5.2.5-r0","5.2.5-r1","5.2.6-r0","5.2.6-r1","5.2.7-r0","5.2.8-r0","5.2.9-r0","5.4.0-r0","5.4.0-r1","5.4.1-r0","5.4.2-r0","5.4.2-r1","5.4.3-r0","5.4.3-r1","5.4.4-r0","5.4.5-r0","5.4.6-r0","5.6.1-r0","5.6.1-r1","5.6.1-r2","5.6.1-r3","5.6.2-r0","5.6.2-r1"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2026-34743.json"}},{"package":{"name":"xz","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/xz?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.3-r0"}]}],"versions":["5.0.0-r0","5.0.1-r0","5.0.2-r0","5.0.3-r0","5.0.3-r1","5.0.4-r0","5.0.4-r1","5.0.5-r0","5.0.6-r0","5.0.7-r0","5.2.0-r0","5.2.1-r0","5.2.2-r0","5.2.2-r1","5.2.3-r0","5.2.3-r1","5.2.4-r0","5.2.5-r0","5.2.5-r1","5.2.6-r0","5.2.6-r1","5.2.7-r0","5.2.8-r0","5.2.9-r0","5.4.0-r0","5.4.0-r1","5.4.1-r0","5.4.2-r0","5.4.2-r1","5.4.3-r0","5.4.3-r1","5.4.4-r0","5.4.5-r0","5.4.6-r0","5.6.1-r0","5.6.1-r1","5.6.1-r2","5.6.1-r3","5.6.2-r0","5.6.3-r0","5.6.3-r1"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2026-34743.json"}},{"package":{"name":"xz","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/xz?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.3-r0"}]}],"versions":["5.0.0-r0","5.0.1-r0","5.0.2-r0","5.0.3-r0","5.0.3-r1","5.0.4-r0","5.0.4-r1","5.0.5-r0","5.0.6-r0","5.0.7-r0","5.2.0-r0","5.2.1-r0","5.2.2-r0","5.2.2-r1","5.2.3-r0","5.2.3-r1","5.2.4-r0","5.2.5-r0","5.2.5-r1","5.2.6-r0","5.2.6-r1","5.2.7-r0","5.2.8-r0","5.2.9-r0","5.4.0-r0","5.4.0-r1","5.4.1-r0","5.4.2-r0","5.4.2-r1","5.4.3-r0","5.4.3-r1","5.4.4-r0","5.4.5-r0","5.4.6-r0","5.6.1-r0","5.6.1-r1","5.6.1-r2","5.6.1-r3","5.6.2-r0","5.6.3-r0","5.6.4-r0","5.8.0-r0","5.8.1-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2026-34743.json"}},{"package":{"name":"xz","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/xz?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.8.3-r0"}]}],"versions":["5.0.0-r0","5.0.1-r0","5.0.2-r0","5.0.3-r0","5.0.3-r1","5.0.4-r0","5.0.4-r1","5.0.5-r0","5.0.6-r0","5.0.7-r0","5.2.0-r0","5.2.1-r0","5.2.2-r0","5.2.2-r1","5.2.3-r0","5.2.3-r1","5.2.4-r0","5.2.5-r0","5.2.5-r1","5.2.6-r0","5.2.6-r1","5.2.7-r0","5.2.8-r0","5.2.9-r0","5.4.0-r0","5.4.0-r1","5.4.1-r0","5.4.2-r0","5.4.2-r1","5.4.3-r0","5.4.3-r1","5.4.4-r0","5.4.5-r0","5.4.6-r0","5.6.1-r0","5.6.1-r1","5.6.1-r2","5.6.1-r3","5.6.2-r0","5.6.3-r0","5.6.4-r0","5.8.0-r0","5.8.1-r0","5.8.2-r0"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2026-34743.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}