NULL pointer dereference in Red Hat Directory Server 11

CVE-2026-18453

A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-18453?
CVE-2026-18453 is a high-severity vulnerability in Red Hat Directory Server 11, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-09-07.
How severe is CVE-2026-18453?
High severity. CVSS v3 base score is 7.5 out of 10.