What is CVE-2026-14940?

CVE-2026-14940 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under Heap-based Buffer Overflow. CVSS score: 5.3/10. Published 2026-07-07.

How severe is CVE-2026-14940?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Buffer overflow in Red Hat Directory Server 11

CVE-2026-14940

A heap-buffer-overflow flaw was found in 389 Directory Server (389-ds-base). When normalizing a Distinguished Name (DN) that contains a legacy-quoted value encoding a multivalued nested Relative Distinguished Name (RDN), the server can wri…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

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

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-14940?: CVE-2026-14940 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under Heap-based Buffer Overflow. CVSS score: 5.3/10. Published 2026-07-07.
How severe is CVE-2026-14940?: Medium severity. CVSS v3 base score is 5.3 out of 10.