Skip to content
Fencer Vulns
high 7.5

CVE-2026-18453 json

389-ds-base: 389-ds-base: pre-authentication null pointer dereference via paged results and use_one_backend control in op_shared_search

published 2026-09-07 2 mo ago modified 2026-11-04 4 d ago also EUVD-2026-72456

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.

Patch / fix

  • Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8 8060020260908152739.0ca98e7e
  • Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8 8080020260903102346.f969626e
  • Red Hat Red Hat Directory Server 11.9 for RHEL 8 8100020260904171440.37ed7c03
  • Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9 9020020260903155914.1674d574
  • Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9 9040020260903102623.1674d574
  • Red Hat Red Hat Enterprise Linux 10 0:3.2.0-10.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.0.6-21.el10_0
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.3.11.1-15.el7_9
  • Red Hat Red Hat Enterprise Linux 8 8100020260904155442.25e700aa
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020260901171549.96015a92
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 8040020260901171549.96015a92
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020260901145727.824efc52
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 8060020260901145727.824efc52
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020260831180218.6dbb3803
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020260831180218.6dbb3803
  • Red Hat Red Hat Enterprise Linux 9 0:2.8.0-10.el9_8
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.2.4-22.el9_2
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.4.5-29.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.6.1-24.el9_6
  • Red Hat Red Hat Directory Server 13.2 1788851765
  • 389-ds-base directory server 11.9 1.4.3.39-28.module+el8dsrv+24826+9ffa737d
  • cockpit-389-ds directory server 11.9 1.4.3.39-28.module+el8dsrv+24826+9ffa737d
  • python3-lib389 directory server 11.9 1.4.3.39-28.module+el8dsrv+24826+9ffa737d
  • 389-ds-base-libs directory server 11.9 1.4.3.39-28.module+el8dsrv+24826+9ffa737d
  • 389-ds-base-snmp directory server 11.9 1.4.3.39-28.module+el8dsrv+24826+9ffa737d
  • 389-ds-base-legacy-tools directory server 11.9 1.4.3.39-28.module+el8dsrv+24826+9ffa737d
  • 389-ds-base RHEL 8 1.4.3.39-28.module+el8.10.0+24822+205d20dc
  • python3-lib389 RHEL 8 1.4.3.39-28.module+el8.10.0+24822+205d20dc

red hat advisories RHSA-2026:79217RHSA-2026:64804RHSA-2026:64793RHSA-2026:64791RHSA-2026:64792RHSA-2026:64789

  • 389-ds SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 2.2.11~git12.1e612cde2-150500.3.54.1
  • 389-ds SLE Module for Server Applications 15 SP7 2.8.2~git10.030ada7a6-150700.3.25.1
  • 389-ds SLES for SAP applications 16.0, SLES 16.0 3.0.7~git2.2846d5288-160000.1.1
  • 389-ds SLES for SAP 15 SP6, SLES 15 SP6-LTSS 2.2.11~git12.1e612cde2-150600.8.38.1

suse advisories SUSE-SU-2026:4932-1SUSE-SU-2026:4929-1SUSE-SU-2026:4380-1SUSE-SU-2026:23916-1

  • 389-ds openSUSE Leap 16.0 3.0.7~git2.2846d5288-160000.1.1
  • 389-ds openSUSE Tumbleweed 3.3.1+8c2711bd6-1.1

opensuse advisories openSUSE-SU-2026:21950-1openSUSE-SU-2026:11739-1

  • 389-ds-base AlmaLinux 9 2.8.0-10.el9_8
  • python3-lib389 AlmaLinux 9 2.8.0-10.el9_8
  • 389-ds-base-libs AlmaLinux 9 2.8.0-10.el9_8
  • 389-ds-base-snmp AlmaLinux 9 2.8.0-10.el9_8
  • 389-ds-base AlmaLinux 10 3.2.0-10.el10_2
  • python3-lib389 AlmaLinux 10 3.2.0-10.el10_2
  • 389-ds-base-bdb AlmaLinux 10 3.2.0-10.el10_2
  • 389-ds-base-libs AlmaLinux 10 3.2.0-10.el10_2

almalinux advisories ALSA-2026:64784ALSA-2026:64785ALSA-2026:64791

  • 389-ds-base Rocky Linux 10 3.2.0-10.el10_2
  • 389-ds-base Rocky Linux 9 2.8.0-10.el9_8
  • 389-ds-base Rocky Linux 8 1.4.3.39-28.module+el8.10.0+40311+cd962df1

rocky linux advisories RLSA-2026:64785RLSA-2026:64784RLSA-2026:64791

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-18453 updated cvss 7.5

389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and USE_ONE_BACKEND control in op_shared_search

  • Red Hat Directory Server 12 389-ds-base
    affected: workaround, no fix available “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.”
  • Red Hat Enterprise Linux 6 389-ds-base, 389-ds-base-libs
    affected: workaround, no fix planned “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.”
  • Red Hat CodeReady Linux Builder EUS (v.9.6) 389-ds-base-devel 2.6.1-24.el9_6, 389-ds-base-debuginfo 2.6.1-24.el9_6, 389-ds-base-debugsource 2.6.1-24.el9_6, 389-ds-base-libs-debuginfo 2.6.1-24.el9_6, 389-ds-base-snmp-debuginfo 2.6.1-24.el9_6
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64783
  • Red Hat Directory Server 11.5 E4S for RHEL 8 389-ds-base 1.4.3.34-9.module+el8dsrv+24847+c94540a6, cockpit-389-ds 1.4.3.34-9.module+el8dsrv+24847+c94540a6, python3-lib389 1.4.3.34-9.module+el8dsrv+24847+c94540a6, 389-ds-base-libs 1.4.3.34-9.module+el8dsrv+24847+c94540a6, 389-ds-base-snmp 1.4.3.34-9.module+el8dsrv+24847+c94540a6, 389-ds-base-legacy-tools 1.4.3.34-9.module+el8dsrv+24847+c94540a6
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:79217
  • Red Hat Directory Server 11.7 E4S for RHEL 8 389-ds-base 1.4.3.34-18.module+el8dsrv+24812+0acb1821, cockpit-389-ds 1.4.3.34-18.module+el8dsrv+24812+0acb1821, python3-lib389 1.4.3.34-18.module+el8dsrv+24812+0acb1821, 389-ds-base-libs 1.4.3.34-18.module+el8dsrv+24812+0acb1821, 389-ds-base-snmp 1.4.3.34-18.module+el8dsrv+24812+0acb1821, 389-ds-base-legacy-tools 1.4.3.34-18.module+el8dsrv+24812+0acb1821
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64792
  • Red Hat Directory Server 11.9 for RHEL 8 389-ds-base 1.4.3.39-28.module+el8dsrv+24826+9ffa737d, cockpit-389-ds 1.4.3.39-28.module+el8dsrv+24826+9ffa737d, python3-lib389 1.4.3.39-28.module+el8dsrv+24826+9ffa737d, 389-ds-base-libs 1.4.3.39-28.module+el8dsrv+24826+9ffa737d, 389-ds-base-snmp 1.4.3.39-28.module+el8dsrv+24826+9ffa737d, 389-ds-base-legacy-tools 1.4.3.39-28.module+el8dsrv+24826+9ffa737d
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64793
  • Red Hat Directory Server 12.2 E4S for RHEL 9 389-ds-base 2.2.7-18.module+el9dsrv+24814+6d9b6eb5, cockpit-389-ds 2.2.7-18.module+el9dsrv+24814+6d9b6eb5, python3-lib389 2.2.7-18.module+el9dsrv+24814+6d9b6eb5, 389-ds-base-libs 2.2.7-18.module+el9dsrv+24814+6d9b6eb5, 389-ds-base-snmp 2.2.7-18.module+el9dsrv+24814+6d9b6eb5
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64779
  • Red Hat Directory Server 12.4 E4S for RHEL 9 389-ds-base 2.4.5-26.module+el9dsrv+24813+95aeb06d, cockpit-389-ds 2.4.5-26.module+el9dsrv+24813+95aeb06d, python3-lib389 2.4.5-26.module+el9dsrv+24813+95aeb06d, 389-ds-base-libs 2.4.5-26.module+el9dsrv+24813+95aeb06d, 389-ds-base-snmp 2.4.5-26.module+el9dsrv+24813+95aeb06d
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64780
show 19 more
  • Red Hat Directory Server 13.2 dirsrv/dirsrv-container-rhel10 1788851765
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:65119
  • Red Hat Enterprise Linux AppStream (v. 8) 389-ds-base 1.4.3.39-28.module+el8.10.0+24822+205d20dc, python3-lib389 1.4.3.39-28.module+el8.10.0+24822+205d20dc, 389-ds-base-libs 1.4.3.39-28.module+el8.10.0+24822+205d20dc, 389-ds-base-snmp 1.4.3.39-28.module+el8.10.0+24822+205d20dc, 389-ds-base-legacy-tools 1.4.3.39-28.module+el8.10.0+24822+205d20dc
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64791
  • Red Hat Enterprise Linux AppStream (v. 9) 389-ds-base 2.8.0-10.el9_8, python3-lib389 2.8.0-10.el9_8, 389-ds-base-libs 2.8.0-10.el9_8, 389-ds-base-snmp 2.8.0-10.el9_8
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64784
  • Red Hat Enterprise Linux AppStream (v. 10) 389-ds-base 3.2.0-10.el10_2, python3-lib389 3.2.0-10.el10_2, 389-ds-base-libs 3.2.0-10.el10_2, 389-ds-base-snmp 3.2.0-10.el10_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64785
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) 389-ds-base 1.4.3.34-7.module+el8.4.0+24797+f0b70e95, python3-lib389 1.4.3.34-7.module+el8.4.0+24797+f0b70e95, 389-ds-base-libs 1.4.3.34-7.module+el8.4.0+24797+f0b70e95, 389-ds-base-snmp 1.4.3.34-7.module+el8.4.0+24797+f0b70e95, 389-ds-base-legacy-tools 1.4.3.34-7.module+el8.4.0+24797+f0b70e95
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64789
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) 389-ds-base 1.4.3.34-12.module+el8.6.0+24796+4783e9a9, python3-lib389 1.4.3.34-12.module+el8.6.0+24796+4783e9a9, 389-ds-base-libs 1.4.3.34-12.module+el8.6.0+24796+4783e9a9, 389-ds-base-snmp 1.4.3.34-12.module+el8.6.0+24796+4783e9a9, 389-ds-base-legacy-tools 1.4.3.34-12.module+el8.6.0+24796+4783e9a9
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64790
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) 389-ds-base 1.4.3.35-21.module+el8.8.0+24788+bed99f90, python3-lib389 1.4.3.35-21.module+el8.8.0+24788+bed99f90, 389-ds-base-libs 1.4.3.35-21.module+el8.8.0+24788+bed99f90, 389-ds-base-snmp 1.4.3.35-21.module+el8.8.0+24788+bed99f90, 389-ds-base-legacy-tools 1.4.3.35-21.module+el8.8.0+24788+bed99f90
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64776
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) 389-ds-base 2.2.4-22.el9_2, python3-lib389 2.2.4-22.el9_2, 389-ds-base-libs 2.2.4-22.el9_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64778
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) 389-ds-base 2.4.5-29.el9_4, python3-lib389 2.4.5-29.el9_4, 389-ds-base-libs 2.4.5-29.el9_4
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64781
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) 389-ds-base 3.0.6-21.el10_0, python3-lib389 3.0.6-21.el10_0, 389-ds-base-libs 3.0.6-21.el10_0, 389-ds-base-snmp 3.0.6-21.el10_0
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64804
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) 389-ds-base 2.6.1-24.el9_6, python3-lib389 2.6.1-24.el9_6, 389-ds-base-libs 2.6.1-24.el9_6, 389-ds-base-snmp 2.6.1-24.el9_6
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64783
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) 389-ds-base 1.4.3.34-7.module+el8.4.0+24797+f0b70e95, python3-lib389 1.4.3.34-7.module+el8.4.0+24797+f0b70e95, 389-ds-base-libs 1.4.3.34-7.module+el8.4.0+24797+f0b70e95, 389-ds-base-snmp 1.4.3.34-7.module+el8.4.0+24797+f0b70e95, 389-ds-base-legacy-tools 1.4.3.34-7.module+el8.4.0+24797+f0b70e95
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64789
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) 389-ds-base 1.4.3.34-12.module+el8.6.0+24796+4783e9a9, python3-lib389 1.4.3.34-12.module+el8.6.0+24796+4783e9a9, 389-ds-base-libs 1.4.3.34-12.module+el8.6.0+24796+4783e9a9, 389-ds-base-snmp 1.4.3.34-12.module+el8.6.0+24796+4783e9a9, 389-ds-base-legacy-tools 1.4.3.34-12.module+el8.6.0+24796+4783e9a9
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64790
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) 389-ds-base 1.4.3.35-21.module+el8.8.0+24788+bed99f90, python3-lib389 1.4.3.35-21.module+el8.8.0+24788+bed99f90, 389-ds-base-libs 1.4.3.35-21.module+el8.8.0+24788+bed99f90, 389-ds-base-snmp 1.4.3.35-21.module+el8.8.0+24788+bed99f90, 389-ds-base-legacy-tools 1.4.3.35-21.module+el8.8.0+24788+bed99f90
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64776
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) 389-ds-base-devel 2.8.0-10.el9_8, 389-ds-base-debuginfo 2.8.0-10.el9_8, 389-ds-base-debugsource 2.8.0-10.el9_8, 389-ds-base-libs-debuginfo 2.8.0-10.el9_8, 389-ds-base-snmp-debuginfo 2.8.0-10.el9_8
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64784
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) 389-ds-base-bdb 3.2.0-10.el10_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64785
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) 389-ds-base-bdb 3.0.6-21.el10_0
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64804
  • Red Hat Enterprise Linux Server (v. 7 ELS) 389-ds-base 1.3.11.1-15.el7_9, 389-ds-base-libs 1.3.11.1-15.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) 389-ds-base 1.3.11.1-15.el7_9, 389-ds-base-libs 1.3.11.1-15.el7_9, 389-ds-base-snmp 1.3.11.1-15.el7_9
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:64771
  • Red Hat Directory Server 13 389-ds-base
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8
  • Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8
  • Red Hat Red Hat Directory Server 11.9 for RHEL 8
  • Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9
  • Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Directory Server 13.2
  • Red Hat Red Hat Directory Server 12
  • Red Hat Red Hat Directory Server 13
  • Red Hat Red Hat Enterprise Linux 6

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.