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    CVE-2026-91956

    FreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the URBDRC channel's func_get_ep_desc function that indexes interface arrays by position instead of protocol field InterfaceNumber. A malicious RDP server can send a crafted SELECT_CONFIGURATION message with permuted InterfaceNumber values to read past allocated heap memory and crash the client.

    Published:Sep 15, 2026
    Last Modified:Sep 18, 2026
    EPS:Sep 15, 2026
    EPSS Score:0.00346
    CVSS Score:6.5

    Affected Products

    Vendor
    Freerdp
    Product
    Freerdp

    Exploits

    https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hg4r-vv53-vwf8

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

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    CVE-2026-121961 (CVSS 8.2) — FreeRDP before 3.32.2 contains a use-after-free vulnerability in the freerdp-proxy DRDYNVC tracker when interc…
    CVE-2026-121960 (CVSS 8.7) — FreeRDP before 3.32.2 contains a denial of service vulnerability in the NLA-enabled shadow server when a CredS…
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    CVE-2026-121958 (CVSS 8.7) — FreeRDP through 3.32.1 has a heap out-of-bounds write in the RDPGFX client because the delete_surface callback…
    CVE-2026-121957 (CVSS 8.7) — FreeRDP before 3.32.2 contains a use-after-free vulnerability that allows malicious RDP servers to corrupt cli…
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    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