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CVE-2026-53922 is a stack-based buffer overflow vulnerability in the odhcpd DHCP server used by OpenWrt. An unauthenticated attacker on the same network link can trigger this by sending crafted DHCPv6 RENEW messages with multiple IA_NA options. The flaw involves an integer underflow that disables length checks, allowing attacker-controlled data to overflow a 512-byte stack buffer. The vulnerability causes the odhcpd process to terminate due to stack canary detection, disrupting DHCPv6 service repeatedly. No code execution has been observed in reported configurations. The issue affects odhcpd versions prior to 25.12.5 and has a CVSS 3.1 base score of 6.5 (medium severity). Join the discussion | CVE Database V5 | 10/12/2026, 21:31:24 UTC Added: 10/12/2026, 21:48:57 UTC |
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