What is CVE-2026-73064?

CVE-2026-73064 is a low-severity vulnerability in Trustedfirmware Mbed TLS, classified under CWE-394. CVSS score: 2.9/10. Published 2026-09-24.

How severe is CVE-2026-73064?

Low severity. CVSS v3 base score is 2.9 out of 10.

Vulnerability in Trustedfirmware Mbed TLS

CVE-2026-73064

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.

Published 2026-09-24 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 2.9 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Trustedfirmware Mbed TLS

Weakness classification (CWE)

CWE-394

References

github.com/Mbed-TLS/mbedtls
mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory…

Frequently asked questions

What is CVE-2026-73064?: CVE-2026-73064 is a low-severity vulnerability in Trustedfirmware Mbed TLS, classified under CWE-394. CVSS score: 2.9/10. Published 2026-09-24.
How severe is CVE-2026-73064?: Low severity. CVSS v3 base score is 2.9 out of 10.