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4.9 Medium

CVE-2026-11793 389-ds-base: 389-ds-base: stack buffer overflow in checkprefix() algorithm id parsing

Description

A stack buffer overflow flaw was found in 389 Directory Server. The checkPrefix() function in pw.c copies an attacker-controlled algorithm ID into a 256-byte stack buffer without bounds checking when parsing reversible-encrypted attribute values. An attacker with Directory Manager privileges can crash the LDAP server by storing a crafted credential with an oversized algorithm ID. FORTIFY_SOURCE mitigates this to denial of service only.

CVSS 3.1 detail

Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Exploitable remotely over the network, with an administrator account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
Low
Privileges required
High
Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat Directory Server 11 Versions not published
Red Hat Directory Server 12 Versions not published
Red Hat Directory Server 13 Versions not published
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published

Other CVEs of Red Hat Directory Server 11

The 42 CVEs of Red Hat Directory Server 11 →
CVE-2026-117548 389-ds-base: 389-ds-base: null pointer dereference via modifydn using an attribute's schema alias name causes denial of service 6.5 Medium CVE-2026-86345 389-ds-base: 389-ds-base: starttls plaintext-buffer retention allows on-path attacker to forge an ldap client's authentication result 9.0 Critical CVE-2026-86344 389-ds-base: 389-ds-base: unauthenticated worker-thread-pool exhaustion via completed-operation-then-incomplete-pdu connection requeue 7.5 High CVE-2026-19843 389-ds-base: 389-ds-base: command injection via unescaped ldap dn in cockpit 389 console ldap editor 8.4 High
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