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    CVE-2026-11793

    A stack buffer overflow flaw was found in 389 Directory Server. The checkPrefix() function in pw.c copies an attacker-controlled algorithm ID into a 256-byte stack buffer without bounds checking when parsing reversible-encrypted attribute values. An attacker with Directory Manager privileges can crash the LDAP server by storing a crafted credential with an oversized algorithm ID. FORTIFY_SOURCE mitigates this to denial of service only.

    Published:Jun 9, 2026
    Last Modified:Jun 15, 2026
    EPS:Jun 9, 2026
    EPSS Score:0.00349
    CVSS Score:4.9

    Affected Products

    Vendor
    Redhat
    Product
    389 Directory Server
    Vendor
    Redhat
    Product
    Directory Server
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Redhat Directory Server

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-121 Stack-based Buffer Overflow

    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-2026-11790 (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-2026-11788 (CVSS 5.9) — A flaw was found in 389 Directory Server. The dereference control plugin does not check for allocation failure…
    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…

    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