{"id":"AZL-96938","summary":"CVE-2026-63383 affecting package libevent for versions less than 2.1.13-1","details":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five bytes from evbuffer_pullup but iterates using the full logical buffer length. A fragmented evbuffer containing a six-byte malformed tag can therefore advance past the pullup window and trigger an out-of-bounds read, which can crash a process that decodes attacker-controlled tagged RPC data. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","modified":"2026-09-10T14:17:00.119694905Z","published":"2026-08-20T18:16:35Z","upstream":["CVE-2026-63383"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63383"}],"affected":[{"package":{"name":"libevent","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/libevent"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.13-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-96938.json"}}],"schema_version":"1.9.0"}