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Vulnerability · Published Jun 9, 2026 · Assigned by redhat

CVE-2026-11787389-ds-base: 389-ds-base: heap buffer over-read in ldap_utf8prev() via str2simple filter parsing

Medium 5.0

In plain English

A medium-severity security flaw in Red Hat Directory Server 11 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 3.1)5.0Medium
Exploit odds (30 days)0.2%top 92.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in 389 Directory Server. The ldap_utf8prev() function reads bytes before the start of a buffer without bounds checking, causing a heap buffer over-read in string filter parsing that may influence internal filter processing behavior.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12389-ds-baseno fix listedDEBIAN-CVE-2026-11787
Debian:13389-ds-baseno fix listedDEBIAN-CVE-2026-11787
Ubuntu:22.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11787
Ubuntu:24.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11787
Ubuntu:25.10389-ds-baseno fix listedUBUNTU-CVE-2026-11787
Ubuntu:26.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11787
Ubuntu:26.10389-ds-baseno fix listedUBUNTU-CVE-2026-11787

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Directory Server 11 see references
Red Hat Red Hat Directory Server 12 see references
Red Hat Red Hat Directory Server 13 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-126 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

References