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Fencer Vulns
critical 9.0

CVE-2026-86345 json

389-ds-base: 389-ds-base: starttls plaintext-buffer retention allows on-path attacker to forge an ldap client's authentication result

published 2026-10-01 38 d ago modified 2026-11-07 46 h ago also EUVD-2026-91139

cvss
9.0
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 32%
public exploits
0
none known

Summary

A flaw was found in 389-ds-base. The server does not discard plaintext bytes already buffered from a client connection when negotiating StartTLS, allowing an on-path attacker to inject a crafted LDAP message that is processed after the TLS upgrade and whose response is delivered to the client in place of the client's own pending operation's response, due to messageID collision. This can cause a client application to treat a failed authentication (bind) attempt as successful.

Patch / fix

  • 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 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-2026:4929-1

  • 389-ds openSUSE Tumbleweed 3.3.1+28b6d8afc-1.1

opensuse advisories openSUSE-SU-2026:12312-1

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-2026-86345 updated cvss 9.0

389-ds-base: 389-ds-base: StartTLS plaintext-buffer retention allows on-path attacker to forge an LDAP client's authentication result

  • Red Hat Directory Server 11 389-ds-base, 389-ds-base 1.4.3.39-28.module+el8dsrv+24826+9ffa737d Red Hat Directory Server 12 389-ds-base, 389-ds-base 2.8.0-7.module+el9dsrv+24844+8988a132 Red Hat Directory Server 13 389-ds-base
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 6 389-ds-base, 389-ds-base-libs Red Hat Enterprise Linux 7 389-ds-base, 389-ds-base-libs, 389-ds-base-snmp
    affected: workaround, no fix planned “Out of support scope”
  • 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 Red Hat Enterprise Linux 9 389-ds-base, python3-lib389, 389-ds-base-libs, 389-ds-base-snmp Red Hat Enterprise Linux 10 389-ds-base
    affected: workaround, no fix available

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
total
Assessed
32 d ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/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
  • CWE-923 Improper Restriction of Communication Channel to Intended Endpoints

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.