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    CVE-2026-88806

    A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.

    Published:Sep 21, 2026
    Last Modified:Sep 22, 2026
    EPS:Sep 21, 2026
    EPSS Score:0.00199
    CVSS Score:7.5

    Affected Products

    Vendor
    X.org
    Product
    Libx11

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-94285 (CVSS 5.1) — An out-of-bounds read in libX11's byte-oriented codeset parser in libX11 before 1.8.14 could be used by malici…
    CVE-2026-94284 (CVSS 5.5) — An out-of-bounds read vulnerability in libX11's XIM trigger-key registration parser in libX11 before 1.8.14 co…
    CVE-2026-94283 (CVSS 6.5) — An out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser in libX11 before 1.8.14 …
    CVE-2023-43787 (CVSS 7.8) — A vulnerability was found in libX11 due to an integer overflow within the XCreateImage() function. This flaw a…
    CVE-2023-43785 (CVSS 6.5) — A vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function. This fl…
    CVE-2023-43786 (CVSS 5.5) — A vulnerability was found in libX11 due to an infinite loop within the PutSubImage() function. This flaw allow…
    CVE-2023-3138 (CVSS 7.5) — A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11…
    CVE-2021-31535 (CVSS 9.8) — LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitra…
    CVE-2020-14363 (CVSS 7.8) — An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privi…
    CVE-2020-14344 (CVSS 6.7) — An integer overflow leading to a heap-buffer overflow was found in The X Input Method (XIM) client was impleme…

    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-2026-88806 — X.org (High 7.5) | CVE-DB