CVE-2026-90647.5HighCWE-770

CVE-2026-9064: 389-ds-base: unbounded ldap controls count in get_ldapmessage_controls_ext() causes cpu and heap amplification (remote dos)

Red Hat · Red Hat Directory Server 11.5 E4S for RHEL 8

Vendor fix available · Affected: Red Hat Directory Server 11.5 E4S for RHEL 8 · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.8%probability of exploitation in the next 30 days

57th percentile

050100

Higher than 57% of scored CVEs

7.5HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products20

From the CVE record. A product or version that is not listed is unknown, not unaffected.

389-ds-base0
Red Hat · Red Hat Directory Server 11.5 E4S for RHEL 8Versions not stated
Red Hat · Red Hat Directory Server 11.7 E4S for RHEL 8Versions not stated
Red Hat · Red Hat Directory Server 11.9 for RHEL 8Versions not stated
Red Hat · Red Hat Directory Server 12.2 E4S for RHEL 9Versions not stated
Red Hat · Red Hat Directory Server 12.4 E4S for RHEL 9Versions not stated
Red Hat · Red Hat Enterprise Linux 10Versions not stated
Red Hat · Red Hat Enterprise Linux 10.0 Extended Update SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 8Versions not stated
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnVersions not stated
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnVersions not stated
Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceVersions not stated
Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsVersions not stated
Red Hat · Red Hat Enterprise Linux 9Versions not stated
Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsVersions not stated
Red Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsVersions not stated
Red Hat · Red Hat Enterprise Linux 9.6 Extended Update SupportVersions not stated

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Allocation Without Limits · Denial of Service
Vendor: Red Hat
Published: May 2026
Band: Unlikely (under 1%), May 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-9064 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.

References

8 more references are in the CVE record.