{"id":"CVE-2026-25834","state":"PUBLISHED","title":"Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.","description":"Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.","publishedAt":"2026-04-01T00:00:00.000Z","updatedAt":"2026-04-01T18:54:32.185Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","source":"CISA-ADP"},"assigner":"mitre","products":["n/a n/a"],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":["https://mbed-tls.readthedocs.io/en/latest/security-advisories/","https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-sigalg-injection/"],"weaknesses":["CWE-295","CWE-327"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/25xxx/CVE-2026-25834.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-25834","state":"PUBLISHED","datePublished":"2026-04-01T00:00:00.000Z","dateUpdated":"2026-04-01T18:54:32.185Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2026-02-06T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade."}],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":[{"url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/"},{"url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-sigalg-injection/"}],"problemTypes":[{"descriptions":[{"type":"text","lang":"en","description":"n/a"}]}],"providerMetadata":{"shortName":"mitre","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateUpdated":"2026-04-01T17:49:47.359Z"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":6.5,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-04-01T18:53:56.370902Z","id":"CVE-2026-25834","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-295","type":"CWE","lang":"en","description":"CWE-295 Improper Certificate Validation"}]},{"descriptions":[{"cweId":"CWE-327","type":"CWE","lang":"en","description":"CWE-327 Use of a Broken or Risky Cryptographic Algorithm"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-01T18:54:32.185Z"}}]}}}