{"id":"CVE-2026-9267","details":"Eclipse tinydtls before commit b3efd41ad111a4920f599f51ffa4f5e9f1e72221 contains an out-of-bounds read vulnerability in the check_server_certificate() function that allows unauthenticated attackers to trigger reads beyond valid buffer boundaries by crafting a Certificate handshake message with a specific fragment_length value. Attackers can exploit missing buffer length validation before uint24 reads, memcmp, and memcpy operations during DTLS epoch 0 on both client and server paths to cause denial of service on memory-constrained devices.","modified":"2026-10-08T07:15:43.607150604Z","published":"2026-06-29T08:10:52.567Z","database_specific":{"cna_assigner":"eclipse","cwe_ids":["CWE-125"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9267.json"},"references":[{"type":"WEB","url":"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/112"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9267.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9267"},{"type":"PACKAGE","url":"https://github.com/eclipse-tinydtls/tinydtls"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/eclipse-tinydtls/tinydtls","events":[{"introduced":"0"},{"fixed":"b3efd41ad111a4920f599f51ffa4f5e9f1e72221"}]}],"versions":["initial_contribution"],"database_specific":{"vanir_signatures_modified":"2026-10-08T07:15:43Z","source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9267.json","vanir_signatures":[{"signature_version":"v1","source":"https://github.com/eclipse-tinydtls/tinydtls/commit/b3efd41ad111a4920f599f51ffa4f5e9f1e72221","target":{"file":"dtls.c","function":"check_server_certificate"},"deprecated":false,"digest":{"function_hash":"56981484379777345487943578540244117054","length":1321},"id":"CVE-2026-9267-a6f55901","signature_type":"Function"},{"signature_version":"v1","source":"https://github.com/eclipse-tinydtls/tinydtls/commit/b3efd41ad111a4920f599f51ffa4f5e9f1e72221","target":{"file":"dtls.c"},"deprecated":false,"digest":{"line_hashes":["164967579594099702706464224575554867039","109962370517032031202138573779910048302","242915927904298761692919658249395341018"],"threshold":0.9},"id":"CVE-2026-9267-faac89c3","signature_type":"Line"}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}