Description
A flaw was found in 389-ds-base. The server does not discard plaintext bytes already buffered from a client connection when negotiating StartTLS, allowing an on-path attacker to inject a crafted LDAP message that is processed after the TLS upgrade and whose response is delivered to the client in place of the client's own pending operation's response, due to messageID collision. This can cause a client application to treat a failed authentication (bind) attempt as successful.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Directory Server 11 | — | — |
| Red Hat | Red Hat Directory Server 12 | — | — |
| Red Hat | Red Hat Directory Server 13 | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | 389-ds-base | No fix yet | — |
| Debian 12 | 389-ds-base | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | 389-ds-base | No fix yet | — |
| Ubuntu 26.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu 24.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu 22.04 LTS | 389-ds-base | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu Pro 18.04 LTS | 389-ds-base | No fix yet | — |
| Ubuntu Pro 16.04 LTS | 389-ds-base | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | 389-ds | 2.2.11~git12.1e612cde2-150600.8.38.1 | SUSE-SU-2026:4929-1 |
| SLES 15 SP5 | 389-ds | 2.2.11~git12.1e612cde2-150500.3.54.1 | SUSE-SU-2026:4932-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | 389-ds | 2.2.11~git12.1e612cde2-150600.8.38.1 | SUSE-SU-2026:4929-1 |
| SLES for SAP 15 SP5 | 389-ds | 2.2.11~git12.1e612cde2-150500.3.54.1 | SUSE-SU-2026:4932-1 |
| SLE HPC 15 SP5 | 389-ds | 2.2.11~git12.1e612cde2-150500.3.54.1 | SUSE-SU-2026:4932-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | 389-ds | 3.3.1+28b6d8afc-1.1 | openSUSE-SU-2026:12312-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | 389-ds-base +3 | 1.3.10.2-17.amzn2.0.14 | ALAS2-2026-4003 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | 389-ds-base | No fix yet | — |
Advisories 4
- SUSE-SU-2026:4929-1 Security update for 389-ds SUSE / openSUSE Security Updates · Oct 31, 2026
- SUSE-SU-2026:4932-1 Security update for 389-ds SUSE / openSUSE Security Updates · Oct 31, 2026
- openSUSE-SU-2026:12312-1 389-ds-3.3.1+28b6d8afc-1.1 on GA media SUSE / openSUSE Security Updates · Oct 29, 2026
- ALAS2-2026-4003 Important: 389-ds-base security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 26, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-86345 vdb-entry
- RHBZ#2529332 issue-tracking