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    CVE-2026-56099

    OpenBSD before commit 6a23123 (2026-06-18) contains an out-of-bounds read vulnerability in the mpls_do_error function within sys/netmpls/mpls_input.c that allows remote attackers to disclose kernel stack memory by sending crafted MPLS frames with 16 labels and no Bottom-of-Stack bit set.

    Published:Jun 18, 2026
    Last Modified:Jun 23, 2026
    EPS:Jun 18, 2026
    EPSS Score:0.00356
    CVSS Score:5.3

    Affected Products

    Vendor
    Openbsd
    Product
    Src

    Exploits

    https://pop.argus-systems.ai/advisory/adv-040.htmlhttp://seclists.org/fulldisclosure/2026/Jun/17http://www.openwall.com/lists/oss-security/2026/06/19/3

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    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