CVE-2026-18663: 389-ds-base: pre-authentication double-free in get_ldapmessage_controls_ext() via critical session tracking control
Red Hat · Red Hat Directory Server 11
Affected: Red Hat Directory Server 11 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 44% of scored CVEs
DescriptionCVE.org
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.
Affected products8
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Red Hat · Red Hat Directory Server 11Versions not stated
- Red Hat · Red Hat Directory Server 12Versions not stated
- Red Hat · Red Hat Directory Server 13Versions not stated
- Red Hat · Red Hat Enterprise Linux 10Versions not stated
- Red Hat · Red Hat Enterprise Linux 6Versions not stated
- Red Hat · Red Hat Enterprise Linux 7Versions not stated
- Red Hat · Red Hat Enterprise Linux 8Versions not stated
- Red Hat · Red Hat Enterprise Linux 9Versions not stated
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Weakness
- Double Free · Memory Corruption
- Vendor
- Red Hat
- Published
- August 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-18663 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.