---
id: CVE-2026-11774
title: >-
  An integer overflow flaw was found in the SASL I/O layer of 389 Directory
  Server (389-ds-base)
summary: >-
  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, b…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H'
cwe:
  - CWE-190
  - CWE-190
published: '2026-06-11'
updated: '2026-07-07'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-11774'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:36197'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:36198'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:36204'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:36208'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-11774'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2484916'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-11774'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2484916'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-11774.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00682
epssPercentile: 0.50447
ingestedAt: '2026-07-07T13:53:11.814Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.