CVE-2026-9064
highA flaw was found in 389-ds-base.
Vendor / product: Redhat — directory server
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.
CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (secalert@redhat.com)
Timeline (UTC)
Published: 2026-05-20 10:16
Modified: 2026-11-05 01:17
NVD status: Modified
Last synced 48 minutes ago
Verified against the source API 2026-11-05 01:40 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
redhat / directory_server 11.0, 12.0, 13.0
redhat / 389_directory_server all versions
redhat / enterprise_linux 6.0, 7.0, 8.0, 9.0, 10.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-9064
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2480093
Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-9064
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2480093
Patch / mitigation: https://access.redhat.com/security/cve/CVE-2026-9064
Patch / mitigation: https://access.redhat.com/security/cve/CVE-2026-9064
References
- https://access.redhat.com/errata/RHSA-2026:26452 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26453 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26454 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26455 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26456 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26457 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26458 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26459 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26460 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26461 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26463 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26464 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26465 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26597 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26599 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26639 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:27125 secalert@redhat.com
- https://access.redhat.com/security/cve/CVE-2026-9064 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2480093 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:26452 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://access.redhat.com/errata/RHSA-2026:26453 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://access.redhat.com/errata/RHSA-2026:26454 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://access.redhat.com/errata/RHSA-2026:26455 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://access.redhat.com/errata/RHSA-2026:26456 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- https://access.redhat.com/errata/RHSA-2026:26457 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Data sources
NVD CVE API 2.0 — fetched 2026-11-05 01:40 UTC · record ↗