Description
An integer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), adding sizeof(uint32_t) to a crafted SASL packet length prefix of 0xFFFFFFFC causes unsigned wraparound to zero, bypassing the nsslapd-maxsasliosize limit and leading to a heap buffer overflow of up to approximately 2 megabytes of attacker-controlled data. After a successful SASL bind with integrity protection (SSF > 0), a remote attacker can cause a Denial of Service (DoS) or achieve Remote Code Execution (RCE). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, enrolled host, or service account can trigger this vulnerability over the network. This flaw is independent of CVE-2025-14905, which patched schema.c only and did not modify sasl_io.c.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Directory Server 11.5 E4S for RHEL 8 | — | — |
| Red Hat | Red Hat Directory Server 11.7 E4S for RHEL 8 | — | — |
| Red Hat | Red Hat Directory Server 11.9 for RHEL 8 | — | — |
| Red Hat | Red Hat Directory Server 12.2 E4S for RHEL 9 | — | — |
| Red Hat | Red Hat Directory Server 12.4 E4S for RHEL 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — | — |
| Red Hat | Red Hat Directory Server 13.2 | — | — |
| Red Hat | Red Hat Directory Server 12 | — | — |
| Red Hat | Red Hat Directory Server 13 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
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 25.10 | 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 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | 389-ds-base +5 | 3.2.0-8.el10_2 | RHSA-2026:36196 |
| RHEL 9 | 389-ds-base +4 | 2.8.0-8.el9_8 | RHSA-2026:36195 |
| RHEL 8 | 389-ds-base +5 | 1.4.3.39-25.module+el8.10.0+24462+1b66c107 | RHSA-2026:36201 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | 389-ds-base +5 | 3.0.6-19.el10_0 | RHSA-2026:36670 |
| RHEL 9.6 EUS | 389-ds-base +4 | 2.6.1-22.el9_6 | RHSA-2026:36671 |
| RHEL 9.4 E4S | 389-ds-base +2 | 2.4.5-26.el9_4 | RHSA-2026:36198 |
| RHEL 9.2 E4S | 389-ds-base +2 | 2.2.4-19.el9_2 | RHSA-2026:36585 |
| RHEL 8.8 TUS | 389-ds-base +5 | 1.4.3.35-19.module+el8.8.0+24470+25f37233 | RHSA-2026:36197 |
| RHEL 8.8 E4S | 389-ds-base +5 | 1.4.3.35-19.module+el8.8.0+24470+25f37233 | RHSA-2026:36197 |
| RHEL 8.6 EUS Long Life | 389-ds-base +5 | 1.4.3.34-10.module+el8.6.0+24464+c3b0cd7a | RHSA-2026:36202 |
| RHEL 8.6 AUS | 389-ds-base +5 | 1.4.3.34-10.module+el8.6.0+24464+c3b0cd7a | RHSA-2026:36202 |
| RHEL 8.4 EUS Long Life | 389-ds-base +5 | 1.4.3.34-5.module+el8.4.0+24472+7ce5ce41 | RHSA-2026:36206 |
| RHEL 8.4 AUS | 389-ds-base +5 | 1.4.3.34-5.module+el8.4.0+24472+7ce5ce41 | RHSA-2026:36206 |
| RHEL 7 ELS | 389-ds-base +3 | 1.3.11.1-13.el7_9 | RHSA-2026:36205 |
| Red Hat Directory Server E4s 12 | 389-ds-base +5 | 2.2.7-16.module+el9dsrv+24460+990bd826 | RHSA-2026:36641, RHSA-2026:36209 |
| Red Hat Directory Server E4s 11 | 389-ds-base +6 | 1.4.3.34-7.module+el8dsrv+24471+245dd8e2 | RHSA-2026:36208, RHSA-2026:36204 |
| Red Hat Directory Server 11 | 389-ds-base +6 | 1.4.3.39-25.module+el8dsrv+24463+e272972e | RHSA-2026:36200 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | 389-ds-base +5 | 3.2.0-8.el10_2 | ALSA-2026:36196 |
| AlmaLinux 9 | 389-ds-base +4 | 2.8.0-8.el9_8 | ALSA-2026:36195 |
| AlmaLinux 8 | 389-ds-base +5 | 1.4.3.39-25.module_el8.10.0+4214+f26e0f43 | ALSA-2026:36201 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | 389-ds-base | 3.2.0-8.el10_2 | RLSA-2026:36196 |
| Rocky Linux 9 | 389-ds-base | 2.8.0-8.el9_8 | RLSA-2026:36195 |
| Rocky Linux 8 | 389-ds-base | 1.4.3.39-25.module+el8.10.0+40233+16963435 | RLSA-2026:36201 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | 389-ds | 2.7.0~git212.9b0755edb-150700.3.19.1 | SUSE-SU-2026:3678-1, SUSE-SU-2026:3138-1 |
| SLES 15 SP6 | 389-ds | 2.2.10~git255.752643c78-150600.8.32.1 | SUSE-SU-2026:3686-1, SUSE-SU-2026:3136-1 |
| SLES 15 SP5 | 389-ds | 2.2.10~git255.752643c78-150500.3.48.1 | SUSE-SU-2026:3687-1, SUSE-SU-2026:3137-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | 389-ds | 3.0.6~git382.7a51ea5f5-160000.1.1 | SUSE-SU-2026:23574-1 |
| SLES for SAP 15 SP6 | 389-ds | 2.2.10~git255.752643c78-150600.8.32.1 | SUSE-SU-2026:3686-1, SUSE-SU-2026:3136-1 |
| SLES for SAP 15 SP5 | 389-ds | 2.2.10~git255.752643c78-150500.3.48.1 | SUSE-SU-2026:3687-1, SUSE-SU-2026:3137-1 |
| SLES 16.0 | 389-ds | 3.0.6~git382.7a51ea5f5-160000.1.1 | SUSE-SU-2026:23574-1 |
| SLE HPC 15 SP5 | 389-ds | 2.2.10~git255.752643c78-150500.3.48.1 | SUSE-SU-2026:3687-1, SUSE-SU-2026:3137-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | 389-ds | 3.2.2+4b41542b2-1.1 | openSUSE-SU-2026:11600-1 |
| openSUSE Leap 16.0 | 389-ds | 3.0.6~git382.7a51ea5f5-160000.1.1 | openSUSE-SU-2026:21691-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | 389-ds-base +3 | 1.3.10.2-17.amzn2.0.7 | ALAS2-2026-3796 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | 389-ds-base +5 | 3.2.0-8.el10_2 | ELSA-2026-36196 |
| Oracle Linux 9 | 389-ds-base +4 | 2.8.0-8.el9_8 | ELSA-2026-36195 |
| Oracle Linux 8 | 389-ds-base +5 | 1.4.3.39-25.module+el8.10.0+90949+c5bfd23c | ELSA-2026-36201 |
| Oracle Linux 7 | 389-ds-base +3 | 1.3.11.1-5.0.11.el7_9 | ELSA-2026-36205 |
Advisories 37
- ALSA-2026:36195 Important: 389-ds-base security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:36196 Important: 389-ds-base security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:36201 Important: 389-ds:1.4 security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-2225 Red Hat Enterprise Linux (389-ds-base): Mehrere Schwachstellen ermöglichen Codeausführung und DoS BSI CERT-Bund (WID) · Oct 14, 2026
- SUSE-SU-2026:23574-1 Security update for 389-ds SUSE / openSUSE Security Updates · Sep 29, 2026
- RHSA-2026:36671 Red Hat Security Advisory: 389-ds-base security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36670 Red Hat Security Advisory: 389-ds-base security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36641 Red Hat Security Advisory: redhat-ds:12 security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36585 Red Hat Security Advisory: 389-ds-base security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36209 Red Hat Security Advisory: redhat-ds:12 security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36206 Red Hat Security Advisory: 389-ds:1.4 security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36208 Red Hat Security Advisory: redhat-ds:11 security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36205 Red Hat Security Advisory: 389-ds-base security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36202 Red Hat Security Advisory: 389-ds:1.4 security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36204 Red Hat Security Advisory: redhat-ds:11 security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36200 Red Hat Security Advisory: redhat-ds:11 security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36201 Red Hat Security Advisory: 389-ds:1.4 security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36198 Red Hat Security Advisory: 389-ds-base security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36197 Red Hat Security Advisory: 389-ds:1.4 security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36195 Red Hat Security Advisory: 389-ds-base security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- RHSA-2026:36196 Red Hat Security Advisory: 389-ds-base security update Red Hat Security Advisories (RHSA) · Sep 24, 2026
- openSUSE-SU-2026:21691-1 Security update for 389-ds SUSE / openSUSE Security Updates · Aug 31, 2026
- openSUSE-SU-2026:11600-1 389-ds-3.2.2+4b41542b2-1.1 on GA media SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:3687-1 Security update for 389-ds SUSE / openSUSE Security Updates · Aug 26, 2026
- SUSE-SU-2026:3686-1 Security update for 389-ds SUSE / openSUSE Security Updates · Aug 26, 2026
- ELSA-2026-36205 Important: 389-ds-base security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 24, 2026
- SUSE-SU-2026:3678-1 Security update for 389-ds SUSE / openSUSE Security Updates · Aug 22, 2026
- SUSE-SU-2026:3138-1 Security update for 389-ds SUSE / openSUSE Security Updates · Jul 21, 2026
- SUSE-SU-2026:3136-1 Security update for 389-ds SUSE / openSUSE Security Updates · Jul 21, 2026
- SUSE-SU-2026:3137-1 Security update for 389-ds SUSE / openSUSE Security Updates · Jul 21, 2026
- ELSA-2026-36196 Important: 389-ds-base security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- RLSA-2026:36201 Important: 389-ds:1.4 security update Rocky Linux Security Advisories · Jul 9, 2026
- RLSA-2026:36195 Important: 389-ds-base security update Rocky Linux Security Advisories · Jul 8, 2026
- RLSA-2026:36196 Important: 389-ds-base security update Rocky Linux Security Advisories · Jul 8, 2026
- ELSA-2026-36201 Important: 389-ds:1.4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 8, 2026
- ALAS2-2026-3796 Important: 389-ds-base security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 7, 2026
- ELSA-2026-36195 Important: 389-ds-base security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 7, 2026
References
- RHSA-2026:36195 vendor-advisory
- RHSA-2026:36196 vendor-advisory
- RHSA-2026:36197 vendor-advisory
- RHSA-2026:36198 vendor-advisory
- RHSA-2026:36200 vendor-advisory
- RHSA-2026:36201 vendor-advisory
- RHSA-2026:36202 vendor-advisory
- RHSA-2026:36204 vendor-advisory
- RHSA-2026:36205 vendor-advisory
- RHSA-2026:36206 vendor-advisory
- RHSA-2026:36208 vendor-advisory
- RHSA-2026:36209 vendor-advisory
- RHSA-2026:36585 vendor-advisory
- RHSA-2026:36641 vendor-advisory
- RHSA-2026:36660 vendor-advisory
- RHSA-2026:36670 vendor-advisory
- RHSA-2026:36671 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-11774 vdb-entry
- RHBZ#2484916 issue-tracking