{"id":"AZL-90216","summary":"CVE-2026-56114 affecting package dhcpcd for versions less than 10.0.8-2","details":"dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.","modified":"2026-09-20T05:33:47Z","published":"2026-06-23T17:17:09Z","upstream":["CVE-2026-56114"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56114"}],"affected":[{"package":{"name":"dhcpcd","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/dhcpcd"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.0.8-2"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-90216.json"}}],"schema_version":"1.9.0"}