CVE-2026-73064

EUVD-2026-85930
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
2.9 LOW
LOCAL
HIGH
NONE
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 0.96%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
trustedfirmwarembed_tls
3.2.0 ≤
𝑥
< 3.6.7
CNA
trustedfirmwarembed_tls
4.0.0 ≤
𝑥
< 4.1.1
CNA
Debian logo
Debian Releases
Debian Product
Codename
mbedtls
bookworm
vulnerable
forky
3.6.7-3
fixed
sid
3.6.7-3
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
mbedtls
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
stonking
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://github.com/Mbed-TLS/mbedtls
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-07-random-generator-fault-tls-integrity/