CVE-2026-11774

HIGH 7.6

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

CVSS Score

7.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-190
Vendor	red hat
Product	red hat directory server 11.5 e4s for rhel 8
Published	Jun 11, 2026
Last Updated	Jul 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

Affected Versions

Red Hat / Red Hat Directory Server 11.5 E4S for RHEL 8

All versions affected

Red Hat / Red Hat Directory Server 11.7 E4S for RHEL 8

All versions affected

Red Hat / Red Hat Directory Server 11.9 for RHEL 8

All versions affected

Red Hat / Red Hat Directory Server 12.2 E4S for RHEL 9

All versions affected

Red Hat / Red Hat Directory Server 12.4 E4S for RHEL 9

All versions affected

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

All versions affected

Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

All versions affected

Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service

All versions affected

Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

All versions affected

Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

All versions affected

Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support

All versions affected

Red Hat / Red Hat Directory Server 13.2

All versions affected

Red Hat / Red Hat Directory Server 12

All versions affected

Red Hat / Red Hat Directory Server 13

All versions affected

Red Hat / Red Hat Enterprise Linux 6

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

Credits

This issue was discovered by Ian Murphy (Red Hat).