CVE-2026-18663
Medium
Description
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function frees the parsed controls array on the Session Tracking critical-control rejection path without clearing the SLAPI_REQCONTROLS pblock slot. Operation teardown then frees the same pointer again, causing a double-free. An unauthenticated remote attacker can trigger this with a single BIND request carrying a critical Session Tracking control, resulting in heap corruption and potential denial of service.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Red Hat Directory Server 13
PublishedAug 12, 2026
First seenAug 12, 2026
Weakness typeCWE-415CWE-415
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Red Hat Directory Server 13 | No range specified | — |
| Red Hat Red Hat Enterprise Linux 10 | No range specified | — |
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