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    CVE-2026-11788

    A flaw was found in 389 Directory Server. The dereference control plugin does not check for allocation failure before using a BER structure, allowing an unauthenticated remote attacker to crash the LDAP server when the system is under memory pressure.

    Published:Jun 9, 2026
    Last Modified:Aug 18, 2026
    EPS:Jun 9, 2026
    EPSS Score:0.00583
    CVSS Score:5.9

    Affected Products

    Vendor
    Redhat
    Product
    389 Directory Server
    Vendor
    Redhat
    Product
    Directory Server
    Vendor
    Redhat
    Product
    Directory Server E4s
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Redhat Directory Server
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Els
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Eus Long Life
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-15722 (CVSS 7.5) — A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruvelement_from_berval()…
    CVE-2026-11770 (CVSS 7.5) — A flaw was found in 389 Directory Server. An unauthenticated remote attacker can inject LDAP search filters in…
    CVE-2026-11793 (CVSS 4.9) — A stack buffer overflow flaw was found in 389 Directory Server. The checkPrefix() function in pw.c copies an a…
    CVE-2026-11790 (CVSS 4.9) — A flaw was found in 389 Directory Server. The PBKDF2-SHA256 password storage plugin does not enforce an upper …
    CVE-2026-11789 (CVSS 4.9) — A flaw was found in 389 Directory Server. The SMD5 password storage plugin performs unsigned integer underflow…
    CVE-2026-11787 (CVSS 5) — A flaw was found in 389 Directory Server. The ldap_utf8prev() function reads bytes before the start of a buffe…
    CVE-2026-11785 (CVSS 4.3) — A flaw was found in 389 Directory Server. A type confusion in the SSO token extended operation handler causes …
    CVE-2026-11786 (CVSS 1.9) — A flaw was found in 389 Directory Server. The LDIF parser reads past the end of a heap buffer when processing …
    CVE-2026-11611 (CVSS 6.5) — A flaw was found in 389 Directory Server. The Content Synchronization persistent search plugin allows unbounde…
    CVE-2026-9064 (CVSS 7.5) — A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enfor…

    References

    https://access.redhat.com/errata/RHSA-2026:55421
    https://access.redhat.com/errata/RHSA-2026:55422
    https://access.redhat.com/errata/RHSA-2026:55423
    https://access.redhat.com/errata/RHSA-2026:55424
    https://access.redhat.com/errata/RHSA-2026:55425
    https://access.redhat.com/errata/RHSA-2026:55426
    https://access.redhat.com/errata/RHSA-2026:55530
    https://access.redhat.com/errata/RHSA-2026:55532
    https://access.redhat.com/errata/RHSA-2026:55756
    https://access.redhat.com/errata/RHSA-2026:55757
    https://access.redhat.com/errata/RHSA-2026:55758
    https://access.redhat.com/errata/RHSA-2026:55794
    https://access.redhat.com/errata/RHSA-2026:56047
    https://access.redhat.com/errata/RHSA-2026:56048
    https://access.redhat.com/errata/RHSA-2026:56050
    https://access.redhat.com/security/cve/CVE-2026-11788
    https://bugzilla.redhat.com/show_bug.cgi?id=2485423

    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