Bug#1144475: 389-ds-base: CVE-2026-18663

Source: 389-ds-base
Version: 3.3.0-2
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>

Hi,

The following vulnerability was published for 389-ds-base.

At time of writing only the bugzilla entry from Red Hat was known to
me.

CVE-2026-18663[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-18663
    https://www.cve.org/CVERecord?id=CVE-2026-18663
[1] https://bugzilla.redhat.com/show_bug.cgi?id=2510631

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore