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CVE-2026-18663

389-ds-base: 389-ds-base: pre-authentication double-free in get_ldapmessage_controls_ext() via critical session tracking control

5.9 Medium

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.51%Up 0.1 points since Aug 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.9

389-ds-base: 389-ds-base: pre-authentication double-free in get_ldapmessage_controls_ext() via critical session tracking control

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.

Record
CVE-2026-18663
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-415
Updated
2026-11-05
EUVDEUVD-2026-57153 5.9

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.

Record
EUVD-2026-57153
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-05
GitHub AdvisoriesGHSA-m545-9vp4-qjrp 5.9

A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function frees the parsed...

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.

Record
GHSA-m545-9vp4-qjrp
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-415
Updated
2026-11-02
NVD 5.9

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.

Record
CVE-2026-18663
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-415
Updated
2026-11-05
OSVDEBIAN-CVE-2026-18663 5.9

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.

Record
DEBIAN-CVE-2026-18663
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-18663 5.9

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.

Record
UBUNTU-CVE-2026-18663
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2026:11739-1 No score

389-ds-3.3.1+8c2711bd6-1.1 on GA media

These are all security issues fixed in the 389-ds-3.3.1+8c2711bd6-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11739-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
389-ds-base
Debian:12
 All versions, plus listed versions
2.3.1+dfsg1-12.3.1+dfsg1-1+deb12u12.3.4+dfsg1-12.3.4+dfsg1-1.12.4.4+dfsg1-1
Show 13 moreShow less
2.4.4+dfsg1-32.4.5+dfsg1-13.0.2+dfsg1-13.1.1+dfsg1-13.1.1+dfsg1-23.1.1+dfsg1-33.1.2+dfsg1-13.1.2+vendor1-13.1.2+vendor1-23.3.0-13.3.0-23.3.1-13.3.1-3
 None known
389-ds-base
Debian:13
 All versions, plus listed versions
3.1.2+dfsg1-13.1.2+dfsg1-1+deb13u13.1.2+vendor1-13.1.2+vendor1-23.3.0-13.3.0-23.3.1-13.3.1-3
 None known
389-ds-base
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.3.3.12-1build11.3.3.13-11.3.4.5-21.3.4.8-11.3.4.8-3
Show 4 moreShow less
1.3.4.8-3ubuntu11.3.4.8-41.3.4.9-11.3.4.9-1ubuntu0.1~esm1
 None known
389-ds-base
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.3.7.5-11.3.7.5-1build11.3.7.5-1build21.3.7.9-11.3.7.10-11.3.7.10-1ubuntu11.3.7.10-1ubuntu1+esm1
 None known
389-ds-base
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1.4.1.6-41.4.1.6-4build11.4.2.4-11.4.2.4-1build11.4.3.2-11.4.3.2-1build11.4.3.6-21.4.3.6-2ubuntu0.1~esm1
 None known
389-ds-base
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.4.4.11-2build11.4.4.11-2build21.4.4.17-12.0.11-22.0.14-12.0.15-12.0.15-1ubuntu2
 None known
389-ds-base
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.3.4+dfsg1-12.4.4+dfsg1-1ubuntu12.4.4+dfsg1-1ubuntu42.4.4+dfsg1-32.4.5+dfsg1-1
 None known
389-ds-base
Ubuntu:26.10
 All versions, plus listed versions
3.1.2+vendor1-23.1.2+vendor1-2build13.3.1-3
 None known
389-ds-base
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.1.2+dfsg1-13.1.2+vendor1-2
 None known
389-ds
openSUSE:Tumbleweed
From an advisory covering 8 CVEs
 before 3.3.1+8c2711bd6-1.1
3.3.1+8c2711bd6-1.1

History

History
RecordedChangedSources
affected, factsCVE List, NVD
factsEUVD
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-18663 is a medium vulnerability (CVSS 5.9) in Red Hat Directory Server 11, published August 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. No source names a fixed version.

References

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