{"id":"CVE-2026-55606","aliases":[],"cve":{"records":[{"id":"CVE-2026-55606","source":"GitHub_M","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-06-16T23:31:22.445Z","published":"2026-10-23T13:21:21.038Z","modified":"2026-10-29T17:43:41.478Z"}],"publishers":[{"name":"GitHub_M","role":"CNA","organizationId":"a0819718-46f1-4df5-94e2-005712e83aaa","modified":"2026-10-23T13:21:21.038Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T17:43:41.478Z"}],"references":[{"url":"https://github.com/openwrt/odhcpd/security/advisories/GHSA-x8x4-7gvf-gp45","tags":["x_refsource_CONFIRM"],"source":"GitHub_M"},{"url":"https://github.com/openwrt/odhcpd/pull/401","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/openwrt/odhcpd/commit/6907f28f9ddeef9f69f5ee10bbc9ba8adc0ef57f","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/openwrt/odhcpd/commit/ed38cffa927d5fd450d20bfd3f7fb8d8e8fff301","tags":["x_refsource_MISC"],"source":"GitHub_M"},{"url":"https://github.com/openwrt/odhcpd/security/advisories/GHSA-x8x4-7gvf-gp45","tags":["exploit"],"source":"CISA-ADP"}],"weaknesses":[{"id":"CWE-126","description":"CWE-126: Buffer Over-read","source":"GitHub_M"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T17:43:15.504706Z","decisions":[{"name":"Exploitation","value":"poc"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"odhcpd: Stack buffer overread via DUID length endianness mismatch in memcmp()","titleSource":"GitHub_M","descriptionSource":"GitHub_M","description":"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patches.","score":6.5,"severity":"medium","published":"2026-10-23T13:21:21.038Z","modified":"2026-10-29T17:43:41.478Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"openwrt","name":"odhcpd","platforms":[],"versions":[{"version":"<= 25.12","status":"affected"}],"cpes":[],"source":"GitHub_M","url":"https://www.cve.org/CVERecord?id=CVE-2026-55606"}],"remediation":[],"references":["https://github.com/openwrt/odhcpd/security/advisories/GHSA-x8x4-7gvf-gp45","https://github.com/openwrt/odhcpd/pull/401","https://github.com/openwrt/odhcpd/commit/6907f28f9ddeef9f69f5ee10bbc9ba8adc0ef57f","https://github.com/openwrt/odhcpd/commit/ed38cffa927d5fd450d20bfd3f7fb8d8e8fff301"],"sources":[{"name":"CVE","id":"CVE-2026-55606","modified":"2026-10-29T17:43:41.478Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-55606"}],"assessments":[{"source":"GitHub_M","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","score":6.5}],"sourceAffected":[],"observedAt":"2026-10-29T17:50:48.833Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T18:55:34.234Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-29T18:05:33.321Z","attemptedAt":"2026-10-29T18:05:33.321Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-10-29T18:05:33.319Z","attemptedAt":"2026-10-29T18:05:33.319Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-29T18:05:33.532Z","attemptedAt":"2026-10-29T18:05:33.532Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-29T18:05:34.098Z","attemptedAt":"2026-10-29T18:05:34.098Z"}],"evidence":[{"source":"NVD","id":"CVE-2026-55606","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55606","modified":"2026-10-23T19:37:11.060","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","checkedAt":"2026-10-29T18:05:33.321Z"},{"source":"ENISA EUVD","id":"EUVD-2026-108970","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-108970","modified":"Oct 29, 2026, 5:43:41 PM","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","checkedAt":"2026-10-29T18:05:33.532Z"},{"source":"FIRST EPSS","id":"CVE-2026-55606","url":"https://www.first.org/epss/","probability":0.00379,"percentile":0.31865,"date":"2026-10-29","checkedAt":"2026-10-29T18:05:34.098Z"}],"aiSummary":{"text":"odhcpd versions 25.12 and prior have a stack buffer overread vulnerability via DUID length endianness mismatch in memcmp(). An unauthenticated attacker can trigger a 2560-byte overread from a 128-byte buffer with a single DHCPv6 packet.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:52:41.892Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-55606"}]}}