{"id":"AZL-99090","summary":"CVE-2026-85091 affecting package zlib 1.3.2-1","details":"zlib versions 1.3.1.2 through 1.3.2 contain a heap buffer overflow vulnerability in the gz_vacate() function when processing non-blocking gzwrite() operations with stale external buffer pointers. Attackers can trigger the overflow by calling gzprintf() or gzvprintf() after a write stall, causing an unchecked memmove() to write beyond the internal input buffer boundary.","modified":"2026-09-04T14:17:10.864488187Z","published":"2026-09-03T13:06:20Z","upstream":["CVE-2026-85091"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85091"}],"affected":[{"package":{"name":"zlib","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/zlib"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.3.2-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-99090.json"}}],"schema_version":"1.9.0"}