What is CVE-2026-11791?

CVE-2026-11791 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under Use After Free. CVSS score: 5.0/10. Published 2026-06-18.

How severe is CVE-2026-11791?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Use After Free in Red Hat Directory Server 11

CVE-2026-11791

A flaw was found in 389 Directory Server. During schema reload, the attr_syntax_swap_ht() function unconditionally frees attribute syntax information nodes, bypassing the refcount-based deferred deletion used elsewhere in the attribute syn…

Vulnerability class: Use-After-Free

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H.

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-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-11791?: CVE-2026-11791 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under Use After Free. CVSS score: 5.0/10. Published 2026-06-18.
How severe is CVE-2026-11791?: Medium severity. CVSS v3 base score is 5.0 out of 10.