{"id":"AZL-111188","summary":"CVE-2026-117556 affecting package zchunk 1.3.2-1","details":"zchunk before 1.5.5 contains a heap out-of-bounds read vulnerability in read_preface() in src/lib/header.c that passes the total header length instead of remaining bytes to compint parsing functions. Attackers can supply a crafted .zck file whose header ends inside a compressed integer, causing reads past the heap header buffer and crashing the application.","modified":"2026-10-28T14:18:28.640921776Z","published":"2026-10-27T14:16:36Z","upstream":["CVE-2026-117556"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117556"}],"affected":[{"package":{"name":"zchunk","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/zchunk"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.3.2-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-111188.json"}}],"schema_version":"1.9.2"}