{"id":"CVE-2026-25834","details":"Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.","modified":"2026-07-15T02:18:07.378278654Z","published":"2026-04-01T00:00:00Z","related":["SUSE-SU-2026:1952-1","SUSE-SU-2026:21440-1","SUSE-SU-2026:21981-1","SUSE-SU-2026:22016-1","openSUSE-SU-2026:10498-1","openSUSE-SU-2026:20875-1","openSUSE-SU-2026:21144-1"],"database_specific":{"cna_assigner":"mitre","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25834.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25834.json"},{"type":"ADVISORY","url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/"},{"type":"ADVISORY","url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-sigalg-injection/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25834"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mbed-tls/mbedtls","events":[{"introduced":"8c89224991adff88d53cd380f42a2baa36f91454"},{"fixed":"0bebf8b8c7f07abe3571ded48a11aa907a1ffb20"},{"introduced":"ec4044008d2d069da38288bc76b0fee34ec78646"},{"last_affected":"ec4044008d2d069da38288bc76b0fee34ec78646"}],"database_specific":{"source":["CPE_RANGE","CPE_STRING"],"cpe":["cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:*","cpe:2.3:a:trustedfirmware:mbed_tls:4.0.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"3.3.0"},{"fixed":"3.6.6"},{"introduced":"4.0.0"},{"last_affected":"4.0.0"}]}}],"versions":["4.0.0","v4.0.0","mbedtls-4.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25834.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"}]}