CVE-2026-121952

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    CVE-2026-121952

    Published: 4 Nov 2026Last Modified: 7 Nov 2026

    Summary: FreeRDP before 3.32.2 Proxy Out-of-Bounds Write via Bitmap Cache v2 Capability

    Details: FreeRDP before 3.32.2 has an out-of-bounds write in the proxy because rdp_read_bitmap_cache_v2_capability_set rejects only numCellCaches values above 5, yet the bitmap cache v2 cell array is later accessed at fixed indices 0 through 4. A client connecting to the proxy can declare fewer than five cell caches in its Confirm Active, causing heap corruption, heap data leakage to the backend, or a crash.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121952.json, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xc85-4mqc-xgcx, https://nvd.nist.gov/vuln/detail/CVE-2026-121952, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-proxy-out-of-bounds-write-via-bitmap-cache-v2-capability

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -97eff6ddfbbfaa8e42a126d362686bd001ff8bdc

    Affected versions

    3.5.1
    3.5.0

    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
    CVE-2026-121952 | CVE-DB