CVE-2026-11774

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

publishedCWE-190

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.

Technical severity7.6 highCVSS 3.1 · CNA: redhat

Published2026-06-11Source updated 2026-11-04

Collected2026-11-042 attributed sources

Fixes and workarounds

Workaround

No complete workaround exists; nsslapd-maxsasliosize is bypassed by the integer overflow. Mitigations that reduce exposure: restrict SASL mechanisms (disable DIGEST-MD5 if not required; GSSAPI cannot be disabled in FreeIPA/IdM without breaking Kerberos authentication); firewall LDAP ports (389/636) to trusted networks; monitor for SASL-framed packets with length prefix 0xFFFFFFFC through 0xFFFFFFFF; enable audit logging (nsslapd-auditlog-logging-enabled: on); on RHEL 8, upgrading glibc reduces RCE exploitability but does not eliminate DoS.

Source: CNA: redhat

Fix

RHSA-2026:36205: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) RHSA-2026:36200: Red Hat Directory Server 11.9 for RHEL 8 RHSA-2026:36670: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) RHSA-2026:36196: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) RHSA-2026:36201: Red Hat Enterprise Linux AppStream (v. 8) RHSA-2026:36206: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) RHSA-2026:36202: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) RHSA-2026:36197: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) RHSA-2026:36585: Red Hat Enterprise Linux AppStream E4S (v.9.2) RHSA-2026:36198: Red Hat Enterprise Linux AppStream E4S (v.9.4) RHSA-2026:36671: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6) RHSA-2026:36195: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) RHSA-2026:36204: Red Hat Directory Server 11.5 E4S for RHEL 8 RHSA-2026:36208: Red Hat Directory Server 11.7 E4S for RHEL 8 RHSA-2026:36641: Red Hat Directory Server 12.2 E4S for RHEL 9 RHSA-2026:36209: Red Hat Directory Server 12.4 E4S for RHEL 9 RHSA-2026:36660: Red Hat Directory Server 13.2

Source: ADP: redhat-SADP

Workaround

Source: ADP: redhat-SADP

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Red Hat Directory Server 11.5 E4S for RHEL 8 Red Hat `redhat-ds:11` https://access.redhat.com/downloads/content/package-browser/	≥ 8060020260702180044.0ca98e7e; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Directory Server 11.7 E4S for RHEL 8 Red Hat `redhat-ds:11` https://access.redhat.com/downloads/content/package-browser/	≥ 8080020260702180836.f969626e; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Directory Server 11.9 for RHEL 8 Red Hat `redhat-ds:11` https://access.redhat.com/downloads/content/package-browser/	≥ 8100020260702145313.37ed7c03; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Directory Server 12.2 E4S for RHEL 9 Red Hat `redhat-ds:12` https://access.redhat.com/downloads/content/package-browser/	≥ 9020020260703060155.1674d574; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Directory Server 12.4 E4S for RHEL 9 Red Hat `redhat-ds:12` https://access.redhat.com/downloads/content/package-browser/	≥ 9040020260703055735.1674d574; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:3.2.0-8.el10_2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 10.0 Extended Update Support Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:3.0.6-19.el10_0; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.3.11.1-13.el7_9; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8100020260626120929.25e700aa; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8040020260629123121.96015a92; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8040020260629123121.96015a92; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8060020260626130540.824efc52; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8060020260626130540.824efc52; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8080020260630025241.6dbb3803; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8080020260630025241.6dbb3803; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.8.0-8.el9_8; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.2.4-19.el9_2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.4.5-26.el9_4; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.6.1-22.el9_6; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Directory Server 13.2 Red Hat `dirsrv/dirsrv-container-rhel10` https://catalog.redhat.com/software/containers/	≥ 1783452100; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Directory Server 12 Red Hat `redhat-ds:12/389-ds-base` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Directory Server 13 Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 6 Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Directory Server 11.5 E4S for RHEL 8 Red Hat `redhat-ds:11` https://access.redhat.com/downloads/content/package-browser/	≥ 8060020260702180044.0ca98e7e; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Directory Server 11.7 E4S for RHEL 8 Red Hat `redhat-ds:11` https://access.redhat.com/downloads/content/package-browser/	≥ 8080020260702180836.f969626e; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Directory Server 11.9 for RHEL 8 Red Hat `redhat-ds:11` https://access.redhat.com/downloads/content/package-browser/	≥ 8100020260702145313.37ed7c03; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Directory Server 12.2 E4S for RHEL 9 Red Hat `redhat-ds:12` https://access.redhat.com/downloads/content/package-browser/	≥ 9020020260703060155.1674d574; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Directory Server 12.4 E4S for RHEL 9 Red Hat `redhat-ds:12` https://access.redhat.com/downloads/content/package-browser/	≥ 9040020260703055735.1674d574; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 10 Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:3.2.0-8.el10_2; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 10.0 Extended Update Support Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:3.0.6-19.el10_0; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.3.11.1-13.el7_9; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8 Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8100020260626120929.25e700aa; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8040020260629123121.96015a92; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8040020260629123121.96015a92; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8060020260626130540.824efc52; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8060020260626130540.824efc52; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8080020260630025241.6dbb3803; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat `389-ds:1.4` https://access.redhat.com/downloads/content/package-browser/	≥ 8080020260630025241.6dbb3803; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9 Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.8.0-8.el9_8; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.2.4-19.el9_2; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.4.5-26.el9_4; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	≥ 0:2.6.1-22.el9_6; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Directory Server 13.2 Red Hat `dirsrv/dirsrv-container-rhel10` https://catalog.redhat.com/software/containers/	≥ 1783452100; < * (unaffected, rpm) Other versions: affected	ADP: redhat-SADP
Red Hat Directory Server 12 Red Hat `redhat-ds:12/389-ds-base` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	ADP: redhat-SADP
Red Hat Directory Server 13 Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP
Red Hat Enterprise Linux 6 Red Hat `389-ds-base` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	ADP: redhat-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 7.6 high	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H`	CNA: redhat
3.1 / 7.6 high	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H`	ADP: redhat-SADP

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://access.redhat.com/errata/RHSA-2026:36195CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36196CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36197CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36198CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36200CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36201CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36202CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36204CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36205CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36206CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36208CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36209CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36585CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36641CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36660CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36670CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36671CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-11774CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2484916CNA: redhat · issue-tracking, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-11774ADP: redhat-SADP · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2484916ADP: redhat-SADP · issue-tracking, x_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-11774.jsonADP: redhat-SADP · x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:36205ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36200ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36670ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36196ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36201ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36206ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36202ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36197ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36585ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36198ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36671ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36195ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36204ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36208ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36641ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36209ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36660ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT

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