CVE-2026-9064 (GCVE-0-2026-9064)

Vulnerability from cvelistv5 – Published: 2026-05-20 09:00 – Updated: 2026-06-18 19:46
VLAI
Title
389-ds-base: 389-ds-base: unbounded ldap controls count in get_ldapmessage_controls_ext() causes cpu and heap amplification (remote dos)
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:26452 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26453 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26454 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26455 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26456 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26457 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26458 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26459 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26460 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26461 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26463 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26464 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26465 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26597 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26599 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26639 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27125 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-9064 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2480093 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8 Unaffected: 8060020260609102432.0ca98e7e , < * (rpm)
    cpe:/a:redhat:directory_server_e4s:11.5::el8
 Create a notification for this product.
Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8 Unaffected: 8080020260610130252.f969626e , < * (rpm)
    cpe:/a:redhat:directory_server_e4s:11.7::el8
 Create a notification for this product.
Red Hat Red Hat Directory Server 11.9 for RHEL 8 Unaffected: 8100020260601104139.37ed7c03 , < * (rpm)
    cpe:/a:redhat:directory_server:11.9::el8
 Create a notification for this product.
Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9 Unaffected: 9020020260615123354.1674d574 , < * (rpm)
    cpe:/a:redhat:directory_server_e4s:12.2::el9
 Create a notification for this product.
Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9 Unaffected: 9040020260611130021.1674d574 , < * (rpm)
    cpe:/a:redhat:directory_server_e4s:12.4::el9
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:3.2.0-7.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:3.0.6-18.el10_0 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support Unaffected: 0:1.3.11.1-12.el7_9 , < * (rpm)
    cpe:/o:redhat:rhel_els:7
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8 Unaffected: 8100020260601102239.25e700aa , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 8040020260609102422.96015a92 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 8040020260609102422.96015a92 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 8060020260609102416.824efc52 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 8060020260609102416.824efc52 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6::appstream
    cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 8080020260610125847.6dbb3803 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 8080020260610125847.6dbb3803 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8::appstream
    cpe:/a:redhat:rhel_tus:8.8::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.8.0-7.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/a:redhat:enterprise_linux:9::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:2.2.4-18.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:2.4.5-25.el9_4 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:2.6.1-21.el9_6 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6::appstream
    cpe:/a:redhat:rhel_eus:9.6::crb
 Create a notification for this product.
Red Hat Red Hat Directory Server 13.2 Unaffected: 1781714123 , < * (rpm)
    cpe:/a:redhat:directory_server:13.2::el10
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Red Hat Red Hat Directory Server 12     cpe:/a:redhat:directory_server:12
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Red Hat Red Hat Directory Server 13     cpe:/a:redhat:directory_server:13
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Date Public
2026-05-20 07:30
Credits
Red Hat would like to thank Oleh Konko (1seal.org) for reporting this issue.
Show details on NVD website
To clipboard 

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\"name\": \"RHSA-2026:26458\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26459\", \"name\": \"RHSA-2026:26459\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26460\", \"name\": \"RHSA-2026:26460\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26461\", \"name\": \"RHSA-2026:26461\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26463\", \"name\": \"RHSA-2026:26463\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26464\", \"name\": \"RHSA-2026:26464\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26465\", \"name\": \"RHSA-2026:26465\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26597\", \"name\": \"RHSA-2026:26597\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26599\", \"name\": \"RHSA-2026:26599\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26639\", \"name\": \"RHSA-2026:26639\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:27125\", \"name\": \"RHSA-2026:27125\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2026-9064\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2480093\", \"name\": \"RHBZ#2480093\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"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.\\n\\nOptionally, 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.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-06-18T19:46:42.276Z\"}, \"x_redhatCweChain\": \"CWE-770: Allocation of Resources Without Limits or Throttling\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-9064\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-18T19:46:42.276Z\", \"dateReserved\": \"2026-05-20T08:19:21.037Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-05-20T09:00:42.557Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.