Is CVE-2026-18453 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-18453?

CVE-2026-18453 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-18453

Description

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.