{"id":"CVE-2026-73064","title":"In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream","summary":"In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.","severity":"low","cvss":2.9,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-394"],"vendor":"trustedfirmware","product":"Mbed TLS","affected":["mbed_tls >= 3.2.0 < 3.6.7","mbed_tls >= 4.0.0 < 4.1.1"],"published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T21:04:40.340","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73064","references":[{"url":"https://github.com/Mbed-TLS/mbedtls","label":"cve@mitre.org"},{"url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-07-random-generator-fault-tls-integrity/","label":"cve@mitre.org"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-24T18:00:13.513498Z"},"ingestedAt":"2026-09-24T15:45:56.644Z","slug":"CVE-2026-73064","body":"## Overview\n\nIn Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":16,"depthScoreParts":{"impact":16,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}