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    CVE-2026-82876

    Phison PS3111-S11 controller firmware verifies RSA signatures using a public modulus embedded within the firmware image itself rather than anchored in immutable storage. Attackers can generate arbitrary RSA key pairs, sign modified firmware with the private key, embed the matching modulus in the signature segment, and the controller accepts the tampered firmware as valid.

    Published:Aug 31, 2026
    Last Modified:Sep 2, 2026
    EPS:Aug 31, 2026
    EPSS Score:0.00087
    CVSS Score:8.2

    Affected Products

    Vendor
    Phison Electronics Corporation
    Product
    Ps3111-s11 Controller Firmware

    Exploits

    https://github.com/Hunt-Benito/the-key-ships-with-the-lock-cve-2026-82876-phison-s11-ssd-firmware-signature-bypass

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    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