CVE record · CVE-2026-18355

389-ds-base: 389-ds-base: heap buffer overflow via sasl wrapped-record length lower-bound underflow in sasl_io_start_packet()

CVSS 7.5 HighEPSS 0.0084 · 57th percentile

Published by the CVE Program (CNA: redhat) at 7 Sept 2026, 14:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Red Hat	Red Hat Directory Server 11.5 E4S for RHEL 8 Package name: redhat-ds:11 https://access.redhat.com/downloads/content/package-browser/	unaffected 8060020260908152739.0ca98e7e to before * rpm Other versions: affected
Red Hat	Red Hat Directory Server 11.7 E4S for RHEL 8 Package name: redhat-ds:11 https://access.redhat.com/downloads/content/package-browser/	unaffected 8080020260903102346.f969626e to before * rpm Other versions: affected
Red Hat	Red Hat Directory Server 11.9 for RHEL 8 Package name: redhat-ds:11 https://access.redhat.com/downloads/content/package-browser/	unaffected 8100020260904171440.37ed7c03 to before * rpm Other versions: affected
Red Hat	Red Hat Directory Server 12.2 E4S for RHEL 9 Package name: redhat-ds:12 https://access.redhat.com/downloads/content/package-browser/	unaffected 9020020260903155914.1674d574 to before * rpm Other versions: affected
Red Hat	Red Hat Directory Server 12.4 E4S for RHEL 9 Package name: redhat-ds:12 https://access.redhat.com/downloads/content/package-browser/	unaffected 9040020260903102623.1674d574 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 10 Package name: 389-ds-base https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.2.0-10.el10_2 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support Package name: 389-ds-base https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.0.6-21.el10_0 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support Package name: 389-ds-base https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.3.11.1-15.el7_9 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8 Package name: 389-ds:1.4 https://access.redhat.com/downloads/content/package-browser/	unaffected 8100020260904155442.25e700aa to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Package name: 389-ds:1.4 https://access.redhat.com/downloads/content/package-browser/	unaffected 8040020260901171549.96015a92 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Package name: 389-ds:1.4 https://access.redhat.com/downloads/content/package-browser/	unaffected 8040020260901171549.96015a92 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Package name: 389-ds:1.4 https://access.redhat.com/downloads/content/package-browser/	unaffected 8060020260901145727.824efc52 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Package name: 389-ds:1.4 https://access.redhat.com/downloads/content/package-browser/	unaffected 8060020260901145727.824efc52 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service Package name: 389-ds:1.4 https://access.redhat.com/downloads/content/package-browser/	unaffected 8080020260831180218.6dbb3803 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Package name: 389-ds:1.4 https://access.redhat.com/downloads/content/package-browser/	unaffected 8080020260831180218.6dbb3803 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: 389-ds-base https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.8.0-10.el9_8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Package name: 389-ds-base https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.2.4-22.el9_2 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Package name: 389-ds-base https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.4.5-29.el9_4 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support Package name: 389-ds-base https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.6.1-24.el9_6 to before * rpm Other versions: affected
Red Hat	Red Hat Directory Server 13.2 Package name: dirsrv/dirsrv-container-rhel10 https://catalog.redhat.com/software/containers/	unaffected 1788851765 to before * rpm Other versions: affected
Red Hat	Red Hat Directory Server 12 Package name: redhat-ds:12/389-ds-base https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: affected
Red Hat	Red Hat Directory Server 13 Package name: 389-ds-base https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Enterprise Linux 6 Package name: 389-ds-base https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected

Identifiers: CVE-2026-18355
CNA: redhat
Weakness (CWE): CWE-191
Tags: Red Hat Directory Server 11.5 E4S for RHEL 8
Red Hat Directory Server 11.7 E4S for RHEL 8
Red Hat Directory Server 11.9 for RHEL 8
Red Hat Directory Server 12.2 E4S for RHEL 9
Red Hat Directory Server 12.4 E4S for RHEL 9
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat Enterprise Linux 7 Extended Lifecycle Support
Memory corruption
Published: 7 Sept 2026
Updated: 4 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	CNA (redhat)

CISA KEV Not listed.
EPSS 0.0084, the 57th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

7 Sept 2026, 14:14 UTC Confirmed by the CVE List
7 Sept 2026, 15:17 UTC Confirmed by NVD

Sources

References from the CNA

access.redhat.com/errata/RHSA-2026:64771 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64776 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64778 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64779 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64780 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64781 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64783 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64784 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64785 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64789 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64790 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64791 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64792 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64793 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:64804 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:65119 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:79217 vendor-advisoryredhat
access.redhat.com/security/cve/CVE-2026-18355 vdb-entryredhat
bugzilla.redhat.com/show_bug.cgi?id=2509186 issue-trackingredhat

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.