What is CVE-2026-16560?

CVE-2026-16560 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under CWE-1220. CVSS score: 5.3/10. Published 2026-07-22.

How severe is CVE-2026-16560?

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

Vulnerability in Red Hat Directory Server 11

CVE-2026-16560

A heap-buffer-overflow flaw was found in Directory Server (389-ds-base). When a DN contains a legacy-quoted value, the server won't close the heap allocation allowing another call to refer to the same memory pointer causing a denial of service or an arbitrary memory write operation.

Published 2026-07-22 · last modified 2026-07-22.

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.

EPSS exploit prediction

EPSS: 0.004 (32.6th percentile), scored 2026-10-22.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-1220

References

access.redhat.com/security/cve/CVE-2026-16560 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-16560?: CVE-2026-16560 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under CWE-1220. CVSS score: 5.3/10. Published 2026-07-22.
How severe is CVE-2026-16560?: Medium severity. CVSS v3 base score is 5.3 out of 10.