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    CVE-2026-40393

    In Mesa before 25.3.6 and 26 before 26.0.1, out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated data depends on an untrusted party, and is then used for alloca.

    Published:Apr 12, 2026
    Last Modified:Apr 16, 2026
    EPS:Apr 12, 2026
    EPSS Score:0.00043
    CVSS Score:8.1

    Affected Products

    Vendor
    Mesa3d
    Product
    Mesa

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2023-45913 (CVSS 6.2) — Mesa v23.0.4 was discovered to contain a NULL pointer dereference via the function dri2GetGlxDrawableFromXDraw…
    CVE-2023-45919 (CVSS 5.3) — Mesa 23.0.4 was discovered to contain a buffer over-read in glXQueryServerString(). NOTE: this is disputed bec…
    CVE-2023-45922 (CVSS 4.3) — glx_pbuffer.c in Mesa 23.0.4 was discovered to contain a segmentation violation when calling __glXGetDrawableA…
    CVE-2023-45931 (CVSS 7.5) — Mesa 23.0.4 was discovered to contain a NULL pointer dereference in check_xshm() for the has_error state. NOTE…
    CVE-2019-5068 (CVSS 4.4) — An exploitable shared memory permissions vulnerability exists in the functionality of X11 Mesa 3D Graphics Lib…
    CVE-2013-1872 (CVSS 6.8) — The Intel drivers in Mesa 8.0.x and 9.0.x allow context-dependent attackers to cause a denial of service (reac…
    CVE-2013-1993 (CVSS 6.8) — Multiple integer overflows in X.org libGLX in Mesa 9.1.1 and earlier allow X servers to trigger allocation of …

    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