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    CVE-2026-25834

    Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.

    Published:Apr 1, 2026
    Last Modified:Jun 5, 2026
    EPS:Apr 1, 2026
    EPSS Score:0.00021
    CVSS Score:6.5

    Affected Products

    Vendor
    Mbed-tls
    Product
    Mbedtls
    Vendor
    Trustedfirmware
    Product
    Mbed Tls

    Exploits

    No exploit reference

    Related CVEs

    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-2026-25835 (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-2026-34875 (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-2025-66442 (CVSS 5.1) — In Mbed TLS through 4.0.0, there is a compiler-induced timing side channel (in RSA and CBC/ECB decryption) tha…
    CVE-2026-34872 (CVSS 9.1) — An issue was discovered in Mbed TLS 3.5.x and 3.6.x through 3.6.5 and TF-PSA-Crypto 1.0. There is a lack of co…
    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-2026-34873 (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-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-2026-34871 (CVSS 6.7) — An issue was discovered in Mbed TLS before 3.6.6 and 4.x before 4.1.0 and TF-PSA-Crypto before 1.1.0. There is…
    CVE-2025-59438 (CVSS 5.3) — Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.…

    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