{"schema":"threatline.record/2","record":{"id":"CVE-2026-53920","aliases":["GHSA-p769-5v73-pc4f"],"summary":"odhcpd DHCPv6 Short IA_NA/IA_PD Body Stack Disclosure","details":"odhcpd is the DHCPv6, DHCPv4, and router-advertisement server used by OpenWrt. From version 17.01.0 to before version 25.12.3, odhcpd's DHCPv6 IA parser accepts an IA_NA or IA_PD option whose body is shorter than struct dhcpv6_ia_hdr, casts the option header to that full structure, and reads ia->iaid before proving that the IA body contains the IAID field. If an unauthenticated network-adjacent client places a zero-length or otherwise short IA option at the end of odhcpd's 8192-byte receive stack buffer, the IAID read crosses from data_buf into adjacent stack memory. The disclosed bytes are then reflected in the DHCPv6 reply IAID; prior ARM validation showed data_buf[8192:8196] disclosing the saved stack canary, and wider stack scans can leak ASLR-useful stack/process contents. This issue has been patched in version 25.12.3.","categories":["Network & edge"],"product":"odhcpd","vendor":"openwrt","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-53920","source_modified_at":"2026-10-23T20:58:10.536Z","fetched_at":"2026-10-23T21:10:45.942435Z","product":"odhcpd","vendor":"openwrt","versions":[{"version":">= 17.01.0, < 25.12.3","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":8.7,"severity":"High","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T13:20:48.045Z","modified_at":"2026-10-23T20:58:10.536Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-53920","fetched_at":"2026-10-23T21:10:45.942435Z","source_modified_at":"2026-10-23T20:58:10.536Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/openwrt/odhcpd/security/advisories/GHSA-p769-5v73-pc4f","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/openwrt/odhcpd/commit/719fc3abc0d7e7059871f9f572fb05ada86b8ff2","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/openwrt/odhcpd/commit/f2275efc72a87a95f971f159babcbadc5d241d42","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-23T17:33:12.791918Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"vendor and product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T20:58:10.536Z","content_hash":"b8fce72916b479013e1ebaf1c4384438b5c94c8807b5003d0289fe56941673b4"}}