Red HatCVE-2026-18453
Red Hat 389 Directory Server: denial of service
High7.5CVE-2026-18453 · Published Sep 7, 2026 · updated Sep 9, 2026
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.
Affected versions
The source does not list versions here. See the source advisory for affected products and fixes.
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-476
- www.cve.org/CVERecord?id=CVE-2026-18453
- nvd.nist.gov/vuln/detail/CVE-2026-18453
- access.redhat.com/errata/RHSA-2026:64771
- access.redhat.com/errata/RHSA-2026:64776
- access.redhat.com/errata/RHSA-2026:64778
- access.redhat.com/errata/RHSA-2026:64779
- access.redhat.com/errata/RHSA-2026:64780
- access.redhat.com/errata/RHSA-2026:64781
- access.redhat.com/errata/RHSA-2026:64783
- access.redhat.com/errata/RHSA-2026:64784
- access.redhat.com/errata/RHSA-2026:64785
- access.redhat.com/errata/RHSA-2026:64789
- access.redhat.com/errata/RHSA-2026:64790
- access.redhat.com/errata/RHSA-2026:64791
- access.redhat.com/errata/RHSA-2026:64792
- access.redhat.com/errata/RHSA-2026:64793
- access.redhat.com/errata/RHSA-2026:64804
- access.redhat.com/errata/RHSA-2026:65119
- access.redhat.com/security/cve/CVE-2026-18453
- bugzilla.redhat.com/show_bug.cgi?id=2509696
More Red Hat advisories
All Red Hat| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 7 | Red Hat GLib2.: link following | Medium5.3 | No fix yet |
| Sep 7 | Red Hat 389 Directory Server: improper authentication | Critical9.8 | No fix yet |
| Sep 7 | Red Hat 389-ds-base. The Cockpit 389 Console: command injection | High8.4 | No fix yet |
| Sep 7 | Red Hat: buffer overflow | High7.5 | No fix yet |
| Sep 7 | Red Hat 389 Directory Server: improper access control | High7.5 | No fix yet |
| Sep 7 | Red Hat FreeIPA: improper access control | High8.1 | No fix yet |