CVE-2026-55606

CVE-2026-55606 · odhcpd: Stack buffer overread via DUID length endianness mismatch in memcmp()

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

odhcpd is the DHCPv6, DHCPv4, and router-advertisement server used by OpenWrt. In versions 25.12 and prior, odhcpd's DHCPv6 self-loop detection at dhcpv6.c:720 uses a network-byte-order DUID length value directly as the memcmp() size parameter. On little-endian hosts, this causes memcmp() to read far beyond the stack buffer — a single unauthenticated DHCPv6 packet triggers a 2560-byte overread from a 128-byte buffer. At time of publication, there are no publicly available patches.

CVSS 6.5 · Moyenne · EPSS 0,4%

Publication

2026-10-23T13:21:21.038Z

Mise à jour

2026-10-23T13:21:21.038Z

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