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Vulnerability · Published Jul 7, 2026 · Assigned by redhat

CVE-2026-11610389-ds-base: 389-ds-base: heap buffer overflow in sasl_io_recv() via padded sasl unbind

High 8.8

In plain English

A high-severity heap buffer overflow in 389-ds-base from 389ds. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.5%top 57.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). After a successful SASL bind with integrity protection (SSF > 0), an authenticated attacker can send a specially crafted oversized LDAP UNBIND packet that is copied into a 512-byte heap receive buffer without a bounds check in sasl_io_recv() in sasl_io.c. This allows up to approximately 2 megabytes of attacker-controlled data to overflow the buffer, causing a denial of service (server crash). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, any enrolled host, or any service account can trigger this vulnerability over the network after authenticating via GSSAPI. The vulnerable code path has existed since approximately 2013 (389-ds-base 1.3.2) and was not addressed by the CVE-2025-14905 fix, which patched a separate heap overflow in schema.c only.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10389-ds-base3.2.0-10.el10_2ALSA-2026:64785
AlmaLinux:10389-ds-base3.2.0-8.el10_2ALSA-2026:36196
AlmaLinux:8389-ds-base1.4.3.39-25.module_el8.10.0+4214+f26e0f43ALSA-2026:36201
AlmaLinux:9389-ds-base2.8.0-8.el9_8ALSA-2026:36195
AlmaLinux:9389-ds-base2.8.0-10.el9_8ALSA-2026:64784
AlmaLinux:10389-ds-base-bdb3.2.0-10.el10_2ALSA-2026:64785
AlmaLinux:10389-ds-base-bdb3.2.0-8.el10_2ALSA-2026:36196
AlmaLinux:10389-ds-base-devel3.2.0-8.el10_2ALSA-2026:36196
AlmaLinux:10389-ds-base-devel3.2.0-10.el10_2ALSA-2026:64785
AlmaLinux:8389-ds-base-devel1.4.3.39-25.module_el8.10.0+4214+f26e0f43ALSA-2026:36201
AlmaLinux:9389-ds-base-devel2.8.0-10.el9_8ALSA-2026:64784
AlmaLinux:9389-ds-base-devel2.8.0-8.el9_8ALSA-2026:36195
AlmaLinux:8389-ds-base-legacy-tools1.4.3.39-25.module_el8.10.0+4214+f26e0f43ALSA-2026:36201
AlmaLinux:10389-ds-base-libs3.2.0-8.el10_2ALSA-2026:36196
AlmaLinux:10389-ds-base-libs3.2.0-10.el10_2ALSA-2026:64785
AlmaLinux:8389-ds-base-libs1.4.3.39-25.module_el8.10.0+4214+f26e0f43ALSA-2026:36201
AlmaLinux:9389-ds-base-libs2.8.0-10.el9_8ALSA-2026:64784
AlmaLinux:9389-ds-base-libs2.8.0-8.el9_8ALSA-2026:36195
AlmaLinux:10389-ds-base-snmp3.2.0-8.el10_2ALSA-2026:36196
AlmaLinux:10389-ds-base-snmp3.2.0-10.el10_2ALSA-2026:64785
AlmaLinux:8389-ds-base-snmp1.4.3.39-25.module_el8.10.0+4214+f26e0f43ALSA-2026:36201
AlmaLinux:9389-ds-base-snmp2.8.0-8.el9_8ALSA-2026:36195
AlmaLinux:9389-ds-base-snmp2.8.0-10.el9_8ALSA-2026:64784
AlmaLinux:10python3-lib3893.2.0-10.el10_2ALSA-2026:64785
AlmaLinux:10python3-lib3893.2.0-8.el10_2ALSA-2026:36196
AlmaLinux:8python3-lib3891.4.3.39-25.module_el8.10.0+4214+f26e0f43ALSA-2026:36201
AlmaLinux:9python3-lib3892.8.0-8.el9_8ALSA-2026:36195
AlmaLinux:9python3-lib3892.8.0-10.el9_8ALSA-2026:64784
Debian:12389-ds-baseno fix listedDEBIAN-CVE-2026-11610
Debian:13389-ds-baseno fix listedDEBIAN-CVE-2026-11610
Rocky Linux:10389-ds-base0:3.2.0-8.el10_2RLSA-2026:36196
Rocky Linux:8389-ds-base0:1.4.3.39-25.module+el8.10.0+40233+16963435RLSA-2026:36201
Rocky Linux:9389-ds-base0:2.8.0-8.el9_8RLSA-2026:36195
Ubuntu:22.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11610
Ubuntu:24.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11610
Ubuntu:25.10389-ds-baseno fix listedUBUNTU-CVE-2026-11610
Ubuntu:26.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11610
Ubuntu:26.10389-ds-baseno fix listedUBUNTU-CVE-2026-11610

Affected products (as reported)

VendorProductVersions
389ds 389-ds-base 1.3.2 – through 3.3.0
Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8 see references
Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8 see references
Red Hat Red Hat Directory Server 11.9 for RHEL 8 see references
Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9 see references
Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references
Red Hat Red Hat Directory Server 13.2 see references
Red Hat Red Hat Directory Server 12 see references
Red Hat Red Hat Directory Server 13 see references
Red Hat Red Hat Enterprise Linux 6 see references

Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References