{"schema":"threatline.record/2","record":{"id":"CVE-2026-55606","aliases":["GHSA-x8x4-7gvf-gp45"],"summary":"odhcpd: Stack buffer overread via DUID length endianness mismatch in memcmp()","details":"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.","categories":["Network & edge"],"product":"odhcpd","vendor":"openwrt","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-55606","source_modified_at":"2026-10-23T13:21:21.038Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"odhcpd","vendor":"openwrt","versions":[{"version":"<= 25.12","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":6.5,"severity":"Medium","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T13:21:21.038Z","modified_at":"2026-10-23T13:21:21.038Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-55606","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T13:21:21.038Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/openwrt/odhcpd/security/advisories/GHSA-x8x4-7gvf-gp45","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/openwrt/odhcpd/pull/401","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/openwrt/odhcpd/commit/6907f28f9ddeef9f69f5ee10bbc9ba8adc0ef57f","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/openwrt/odhcpd/commit/ed38cffa927d5fd450d20bfd3f7fb8d8e8fff301","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"vendor and product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T13:21:21.038Z","content_hash":"449ca0f7441f05761e13583ddfef0c5a91b14abc5cba8abcc11dfc0bc951317b"}}