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CVE-2026-53918 is a high-severity use-after-free vulnerability in OpenWrt's odhcpd, affecting the DHCPv6 Identity Association (IA) handler. Available details indicate the flaw arises from a dangling first-lease pointer during DHCPv6 IA processing, causing the handler to retain and later dereference freed memory. Because odhcpd is a default-enabled network service in OpenWrt and the issue is described as remotely triggerable, a network-adjacent attacker can reach the vulnerable code path by sending crafted DHCPv6 traffic that exercises IA handling.
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A high-severity use-after-free vulnerability in OpenWrt odhcpd's DHCPv6 IA handler.
An odhcpd vulnerability addressed by a set of DHCPv4/DHCPv6 hardening and memory-safety fixes in the OpenWrt 25.12 branch.
A specific vulnerability in odhcpd addressed in OpenWrt openwrt-25.12 with multiple hardening and memory-safety fixes, including an explicit out-of-bounds read fix in DHCPv6 handling.
A high-severity use-after-free vulnerability in odhcpd's DHCPv6 IA handler caused by a dangling first-lease pointer.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.