Medium [CVE-2026-117548] NULL pointer dereference via ModifyDN using an attribute's schema alias name causes denial of service
This medium-severity Red Hat Linux advisory covers CVE-2026-117548; related products: Red Hat Directory Server 11, Red Hat Directory Server 12, Red Hat Directory Server 13.
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Summary
NULL pointer dereference via ModifyDN using an attribute's schema alias name causes denial of service. Red Hat rates this moderate (CVSS 6.5).
Weakness: CWE-476.
Affected products named by the advisory: Red Hat Directory Server 11; Red Hat Directory Server 12; Red Hat Directory Server 13; Red Hat Enterprise Linux 10; and 10 more.
Affected products named by the advisory: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; and 6 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Mitigation checklist
- Administrators should review custom access control instructions (ACIs) and avoid granting the ModifyDN (rename) right to non-administrative principals unless specifically required. Restricting this right reduces exposure to this issue until a fixed package is available. Neither 389-ds-base's own default ACI templates nor Red Hat Identity Management (IdM/FreeIPA)'s default ACIs grant this right to non-administrative users, so deployments that have not customized their ACIs are not exposed.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
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