CVE-2026-9064High· 7.5▾ TwilightA flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted L…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.2 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.8%
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
389-ds-base all versionsredhat-ds:11 (all versions)redhat-ds:11 (all versions)redhat-ds:11 (all versions)redhat-ds:12 (all versions)redhat-ds:12 (all versions)389-ds-base (all versions)389-ds-base (all versions)389-ds-base (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds:1.4 (all versions)389-ds-base (all versions)389-ds-base (all versions)389-ds-base (all versions)389-ds-base (all versions)dirsrv/dirsrv-container-rhel10 (all versions)redhat-ds:12/389-ds-base (all versions)389-ds-base (all versions)389-ds-baseRefer to the linked advisories for vendor-supplied fixes and affected version ranges.
Restrict network access to the LDAP port (389/tcp, 636/tcp) to trusted networks only using firewall rules or network ACLs. This prevents untrusted remote attackers from reaching the vulnerable code path.
Optionally, lower the nsslapd-maxbersize configuration parameter to reduce the maximum BER message size accepted by the server. Note that this caps bytes, not the number of controls, and does not fully eliminate the amplification. Setting it too low may impact legitimate LDAP operations with large payloads.
Connected by shared product, vendor, weakness, or advisory.
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