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    CVE-2026-2340

    A flaw was found in Samba’s vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file.

    Published:May 27, 2026
    Last Modified:Sep 10, 2026
    EPS:May 27, 2026
    EPSS Score:0.00939
    CVSS Score:6.5

    Affected Products

    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Openshift
    Vendor
    Redhat
    Product
    Openshift Container Platform
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Eus Long Life
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    Samba
    Product
    Samba

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    https://access.redhat.com/errata/RHSA-2026:22644
    https://access.redhat.com/errata/RHSA-2026:22963
    https://access.redhat.com/errata/RHSA-2026:25049
    https://access.redhat.com/errata/RHSA-2026:25979
    https://access.redhat.com/errata/RHSA-2026:28053
    https://access.redhat.com/errata/RHSA-2026:28054
    https://access.redhat.com/errata/RHSA-2026:28055
    https://access.redhat.com/errata/RHSA-2026:28056
    https://access.redhat.com/errata/RHSA-2026:28057
    https://access.redhat.com/errata/RHSA-2026:29863
    https://access.redhat.com/errata/RHSA-2026:56786
    https://access.redhat.com/errata/RHSA-2026:56853
    https://access.redhat.com/errata/RHSA-2026:56911
    https://access.redhat.com/errata/RHSA-2026:57483
    https://access.redhat.com/errata/RHSA-2026:59831
    https://access.redhat.com/errata/RHSA-2026:60019
    https://access.redhat.com/errata/RHSA-2026:62549
    https://access.redhat.com/security/cve/CVE-2026-2340
    https://bugzilla.redhat.com/show_bug.cgi?id=2447318
    https://bugzilla.samba.org/show_bug.cgi?id=15997

    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