CVE-2026-11788
Medium
Description
A flaw was found in 389 Directory Server. The dereference control plugin does not check for allocation failure before using a BER structure, allowing an unauthenticated remote attacker to crash the LDAP server when the system is under memory pressure.
SeverityMedium
CVSS5.9
Exploit probability47. percentile0.6%
Product
Redhat Directory Server
PublishedJun 9, 2026
First seenJun 9, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Vendor advisories
- access.redhat.com/security/cve/CVE-2026-11788
- bugzilla.redhat.com/show_bug.cgi?id=2485423
- access.redhat.com/errata/RHSA-2026:55421
- access.redhat.com/errata/RHSA-2026:55422
- access.redhat.com/errata/RHSA-2026:55423
- access.redhat.com/errata/RHSA-2026:55424
- access.redhat.com/errata/RHSA-2026:55425
- access.redhat.com/errata/RHSA-2026:55426
- access.redhat.com/errata/RHSA-2026:55530
- access.redhat.com/errata/RHSA-2026:55532
- access.redhat.com/errata/RHSA-2026:55756
- access.redhat.com/errata/RHSA-2026:55757
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat directory_server | 11.0, 12.0, 13.0 | — |
| redhat 389_directory_server | No range specified | — |
| redhat enterprise_linux | 7.0, 8.0, 9.0, 10.0 | — |
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