CVE-2026-11774 389-ds-base: 389-ds-base: integer overflow in sasl packet length bypasses size limit leading to heap buffer overflow
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.
CVSS 3.1 detail
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:HExploitable remotely over the network, with an ordinary account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- Interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- High
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Directory Server 11 | Versions not published | |
| Red Hat Directory Server 12 | Versions not published | |
| Red Hat Directory Server 13 | Versions not published | |
| Red Hat Enterprise Linux 10 | Versions not published | |
| Red Hat Enterprise Linux 6 | Versions not published | |
| Red Hat Enterprise Linux 7 | Versions not published | |
| Red Hat Enterprise Linux 8 8100020260626120929.25 | earliest → < 8100020260626120929.25e700aa | 8100020260626120929.25e700aa |
| Red Hat Enterprise Linux 9 | Versions not published | |
| Red Hat Directory Server 11.5 E4S for RHEL 8 8060020260702180044.0 | earliest → < 8060020260702180044.0ca98e7e | 8060020260702180044.0ca98e7e |
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References
- RHSA-2026:36195 access.redhat.com
- RHSA-2026:36196 access.redhat.com
- RHSA-2026:36197 access.redhat.com
- RHSA-2026:36198 access.redhat.com
- RHSA-2026:36200 access.redhat.com
- RHSA-2026:36201 access.redhat.com
- RHSA-2026:36202 access.redhat.com
- RHSA-2026:36204 access.redhat.com
- RHSA-2026:36205 access.redhat.com
- RHSA-2026:36206 access.redhat.com
- RHSA-2026:36208 access.redhat.com
- RHSA-2026:36209 access.redhat.com
- RHSA-2026:36585 access.redhat.com
- RHSA-2026:36641 access.redhat.com
- RHSA-2026:36660 access.redhat.com
- RHSA-2026:36670 access.redhat.com
- RHSA-2026:36671 access.redhat.com
- access.redhat.com access.redhat.com
- RHBZ#2484916 bugzilla.redhat.com
Timeline
- Published
- Last modified