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    CVE-2026-48851

    PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.

    Published:May 25, 2026
    Last Modified:May 26, 2026
    EPS:May 25, 2026
    EPSS Score:0.0003
    CVSS Score:3.1

    Affected Products

    Vendor
    Putty
    Product
    Putty

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-48852 (CVSS 3.7) — PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.…
    CVE-2026-48850 (CVSS 3.7) — PuTTY 0.72 before 0.84 has a double free in RSA KEX.…
    CVE-2026-4115 (CVSS 2.9) — A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c…
    CVE-2024-31497 (CVSS 5.9) — In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user's N…
    CVE-2023-48795 (CVSS 5.9) — The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, al…
    CVE-2021-36367 (CVSS 8.1) — PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentic…
    CVE-2021-33500 (CVSS 7.5) — PuTTY before 0.75 on Windows allows remote servers to cause a denial of service (Windows GUI hang) by telling …
    CVE-2020-14002 (CVSS 5.9) — PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in the algorithm negotiat…
    CVE-2019-17067 (CVSS 9.8) — PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to lis…
    CVE-2019-17068 (CVSS 7.5) — PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, which may allow a session to be …

    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