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Fencer Intel
medium 5.0

CVE-2026-11791 json

389-ds-base: 389-ds-base: use-after-free in schema reload via attr_syntax_swap_ht()

published 4mo ago modified 2d ago also EUVD-2026-37902

cvss
5.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

A flaw was found in 389 Directory Server. During schema reload, the attr_syntax_swap_ht() function unconditionally frees attribute syntax information nodes, bypassing the refcount-based deferred deletion used elsewhere in the attribute syntax subsystem. If an administrator triggers schema reload while concurrent LDAP query traffic is active, worker threads may access freed memory, resulting in use-after-free or double-free and a denial of service (server crash).

Patch / fix

  • 389-ds SLES for SAP applications 16.0, SLES 16.0 3.0.6~git382.7a51ea5f5-160000.1.1
  • 389-ds SLE Module for Server Applications 15 SP7 2.7.0~git234.0afa2e38b-150700.3.22.1
  • 389-ds SLE Module for Server Applications 15 SP7 2.7.0~git212.9b0755edb-150700.3.19.1
  • 389-ds SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 2.2.10~git255.752643c78-150500.3.48.1
  • 389-ds SLES for SAP 15 SP6, SLES 15 SP6-LTSS 2.2.10~git255.752643c78-150600.8.32.1

suse advisories SUSE-SU-2026:23574-1SUSE-SU-2026:3678-1SUSE-SU-2026:3138-1SUSE-SU-2026:3137-1SUSE-SU-2026:3136-1

  • 389-ds openSUSE Leap 16.0 3.0.6~git382.7a51ea5f5-160000.1.1
  • 389-ds openSUSE Tumbleweed 3.2.2+4b41542b2-1.1

opensuse advisories openSUSE-SU-2026:21691-1openSUSE-SU-2026:11600-1

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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-2026-11791 updated cvss 5.0

389-ds-base: 389-ds-base: use-after-free in schema reload via attr_syntax_swap_ht()

  • Red Hat Directory Server 11 389-ds-base 1.4.3.34-5.module+el8dsrv+24053+0eac3b1a Red Hat Directory Server 12 389-ds-base 2.4.5-22.module+el9dsrv+24021+288fb6da Red Hat Directory Server 13 389-ds-base 3.2.0-5.el10dsrv Red Hat Enterprise Linux 7 389-ds-base, 389-ds-base-libs, 389-ds-base-snmp, 389-ds-base 3.2.0-5.el10dsrv Red Hat Enterprise Linux 8 389-ds-base, cockpit-389-ds, python3-lib389, 389-ds-base-libs, 389-ds-base-snmp, 389-ds-base-legacy-tools, +1 more Red Hat Enterprise Linux 9 389-ds-base, python3-lib389, 389-ds-base-libs, 389-ds-base-snmp, 389-ds-base 3.2.0-5.el10dsrv
    +1 more products
    Red Hat Enterprise Linux 10 389-ds-base 3.2.0-5.el10dsrv
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 6 389-ds-base, 389-ds-base-libs, 389-ds-base 3.2.0-5.el10dsrv
    not affected: vulnerable code 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
no
Technical impact
partial
Assessed
4mo ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 5.0 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
NVD 3.1 5.0 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H

Affected products

  • Red Hat Red Hat Directory Server 11
  • Red Hat Red Hat Directory Server 12
  • Red Hat Red Hat Directory Server 13
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness

References

Sources

Fencer Intel 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.