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    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:Sep 24, 2026
    Last Modified:Sep 26, 2026
    EPS:Sep 24, 2026
    EPSS Score:0.00102
    CVSS Score:2.9

    Affected Products

    Vendor
    Trustedfirmware
    Product
    Mbed Tls

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-25832 (CVSS 3.7) — In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting …
    CVE-2026-34876 (CVSS 7.5) — An issue was discovered in Mbed TLS 3.x before 3.6.6. An out-of-bounds read vulnerability in mbedtls_ccm_finis…
    CVE-2026-34877 (CVSS 9.8) — An issue was discovered in Mbed TLS versions from 2.19.0 up to 3.6.5, Mbed TLS 4.0.0. Insufficient protection …
    CVE-2026-34875 (CVSS 9.8) — An issue was discovered in Mbed TLS through 3.6.5 and TF-PSA-Crypto 1.0.0. A buffer overflow can occur in publ…
    CVE-2026-25833 (CVSS 7.5) — Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow in the x509_inet_pton_ipv6() function…
    CVE-2026-25834 (CVSS 6.5) — Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.…
    CVE-2026-25835 (CVSS 7.7) — Mbed TLS before 3.6.6 and TF-PSA-Crypto before 1.1.0 misuse seeds in a Pseudo-Random Number Generator (PRNG).…
    CVE-2026-34874 (CVSS 7.5) — An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference i…
    CVE-2026-34873 (CVSS 9.1) — An issue was discovered in Mbed TLS 3.5.0 through 4.0.0. Client impersonation can occur while resuming a TLS 1…
    CVE-2025-49087 (CVSS 4) — In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal allows an a…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High