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    CVE-2026-23531

    FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, in ClearCodec, when `glyphData` is present, `clear_decompress` calls `freerdp_image_copy_no_overlap` without validating the destination rectangle, allowing an out-of-bounds read/write via crafted RDPGFX surface updates. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.

    Published:Jan 19, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 19, 2026
    EPSS Score:0.00137
    CVSS Score:9.8

    Affected Products

    Vendor
    Freerdp
    Product
    Freerdp

    Exploits

    https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xj5h-9cr5-23c5

    Common Weakness Enumeration

    CWE-122 Heap-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-85089 (CVSS 7.1) — FreeRDP versions 3.0.0 through 3.30.0 (before 3.31.0) transmit uninitialized heap memory in Save Session Info …
    CVE-2026-85090 (CVSS 5.3) — FreeRDP before 3.31.0 contains a heap out-of-bounds read vulnerability in the general_ChromaV1ToYUV444 functio…
    CVE-2026-69159 (CVSS 5.4) — ** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: CVE-2026-67306. Reason: This candidate is a duplica…
    CVE-2026-63633 (CVSS 7.7) — FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, freerdp_dsp_decode_opus in l…
    CVE-2026-63652 (CVSS 7.1) — FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, rdpsnd_server_recv_formats i…
    CVE-2026-63117 (CVSS 6.5) — FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, an authenticated RDP client …
    CVE-2026-55192 (CVSS 7.2) — FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP H.264 decoder backen…
    CVE-2026-55194 (CVSS 8.7) — FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, rpc_client_recv_fragment in …
    CVE-2026-55648 (CVSS 6.1) — FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, freerdp_image_copy_from_icon…
    CVE-2026-55193 (CVSS 8.7) — FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, FreeRDP clients using TS Gat…

    References

    https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L1139-L1145
    https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0
    https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xj5h-9cr5-23c5
    https://access.redhat.com/errata/RHSA-2026:2048
    https://access.redhat.com/errata/RHSA-2026:2081
    https://access.redhat.com/errata/RHSA-2026:2222
    https://access.redhat.com/errata/RHSA-2026:2714
    https://access.redhat.com/errata/RHSA-2026:2736
    https://access.redhat.com/errata/RHSA-2026:2770
    https://access.redhat.com/errata/RHSA-2026:2824
    https://access.redhat.com/errata/RHSA-2026:2952
    https://access.redhat.com/errata/RHSA-2026:3036
    https://access.redhat.com/errata/RHSA-2026:3037
    https://access.redhat.com/errata/RHSA-2026:3038
    https://access.redhat.com/errata/RHSA-2026:3039
    https://access.redhat.com/errata/RHSA-2026:3041
    https://access.redhat.com/security/cve/CVE-2026-23531
    https://bugzilla.redhat.com/show_bug.cgi?id=2430887
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23531.json

    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