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Vulnerability · Published Jun 11, 2026 · Assigned by redhat

CVE-2026-11774389-ds-base: 389-ds-base: integer overflow in sasl packet length bypasses size limit leading to heap buffer overflow

High 7.6

In plain English

A high-severity integer overflow in Red Hat Directory Server 11.5 E4S for RHEL 8 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.6High
Exploit odds (30 days)0.7%top 47.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
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:10389-ds-base-bdb3.2.0-8.el10_2ALSA-2026:36196
AlmaLinux:10389-ds-base-devel3.2.0-8.el10_2ALSA-2026:36196
AlmaLinux:8389-ds-base-devel1.4.3.39-25.module_el8.10.0+4214+f26e0f43ALSA-2026:36201
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:8389-ds-base-libs1.4.3.39-25.module_el8.10.0+4214+f26e0f43ALSA-2026:36201
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: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: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
Debian:12389-ds-baseno fix listedDEBIAN-CVE-2026-11774
Debian:13389-ds-baseno fix listedDEBIAN-CVE-2026-11774
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-2026-11774
Ubuntu:24.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11774
Ubuntu:25.10389-ds-baseno fix listedUBUNTU-CVE-2026-11774
Ubuntu:26.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11774
Ubuntu:26.10389-ds-baseno fix listedUBUNTU-CVE-2026-11774

Affected products (as reported)

VendorProductVersions
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-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

References