CVE-2026-18355

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2026
Source publication: Sep 7, 2026
Source updated: Oct 8, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

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

A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), the wrapped-record length read from the wire is validated only against an upper bound. A small wire length (0, 1, or 2) produces an encrypted_buffer_count below the already-consumed encrypted_buffer_offset, causing an unsigned subtraction underflow in sasl_io_read_packet(). PR_Recv is then requested to read approximately 4 GiB into a 1024-byte heap buffer, resulting in a heap buffer overflow with attacker-controlled content. After a successful SASL bind with integrity protection (SSF > 0), a remote authenticated attacker can cause a denial of service or potentially achieve remote code execution. This flaw is distinct from CVE-2026-11774, whose fix only guards against upper-bound overflow.

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Red Hat Directory Server 11.5 E4S for RHEL 8

Vendor: Red Hat
Product: Red Hat Directory Server 11.5 E4S for RHEL 8
Platforms: Unknown
Default status: affected
Package: redhat-ds:11
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Directory Server 11.5 E4S for RHEL 8 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
8060020260908152739.0ca98e7e	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Directory Server 11.7 E4S for RHEL 8

Vendor: Red Hat
Product: Red Hat Directory Server 11.7 E4S for RHEL 8
Platforms: Unknown
Default status: affected
Package: redhat-ds:11
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Directory Server 11.7 E4S for RHEL 8 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
8080020260903102346.f969626e	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Directory Server 11.9 for RHEL 8

Vendor: Red Hat
Product: Red Hat Directory Server 11.9 for RHEL 8
Platforms: Unknown
Default status: affected
Package: redhat-ds:11
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Directory Server 11.9 for RHEL 8 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
8100020260904171440.37ed7c03	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Directory Server 12.2 E4S for RHEL 9

Vendor: Red Hat
Product: Red Hat Directory Server 12.2 E4S for RHEL 9
Platforms: Unknown
Default status: affected
Package: redhat-ds:12
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Directory Server 12.2 E4S for RHEL 9 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
9020020260903155914.1674d574	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Directory Server 12.4 E4S for RHEL 9

Vendor: Red Hat
Product: Red Hat Directory Server 12.4 E4S for RHEL 9
Platforms: Unknown
Default status: affected
Package: redhat-ds:12
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Directory Server 12.4 E4S for RHEL 9 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
9040020260903102623.1674d574	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 10

Vendor: Red Hat
Product: Red Hat Enterprise Linux 10
Platforms: Unknown
Default status: affected
Package: 389-ds-base
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 10 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:3.2.0-10.el10_2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 10.0 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 10.0 Extended Update Support
Platforms: Unknown
Default status: affected
Package: 389-ds-base
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 10.0 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:3.0.6-21.el10_0	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 7 Extended Lifecycle Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 7 Extended Lifecycle Support
Platforms: Unknown
Default status: affected
Package: 389-ds-base
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 7 Extended Lifecycle Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:1.3.11.1-15.el7_9	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8
Platforms: Unknown
Default status: affected
Package: 389-ds:1.4
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
8100020260904155442.25e700aa	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Platforms: Unknown
Default status: affected
Package: 389-ds:1.4
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
8040020260901171549.96015a92	`unaffected`	rpm	*	Unavailable	None listed

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

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
Platforms: Unknown
Default status: affected
Package: 389-ds:1.4
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
8040020260901171549.96015a92	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Platforms: Unknown
Default status: affected
Package: 389-ds:1.4
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
8060020260901145727.824efc52	`unaffected`	rpm	*	Unavailable	None listed

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

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
Platforms: Unknown
Default status: affected
Package: 389-ds:1.4
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
8060020260901145727.824efc52	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Platforms: Unknown
Default status: affected
Package: 389-ds:1.4
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.8 Telecommunications Update Service · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
8080020260831180218.6dbb3803	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: 389-ds:1.4
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
8080020260831180218.6dbb3803	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9
Platforms: Unknown
Default status: affected
Package: 389-ds-base
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:2.8.0-10.el9_8	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: 389-ds-base
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:2.2.4-22.el9_2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: 389-ds-base
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:2.4.5-29.el9_4	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.6 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.6 Extended Update Support
Platforms: Unknown
Default status: affected
Package: 389-ds-base
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.6 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:2.6.1-24.el9_6	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Directory Server 13.2

Vendor: Red Hat
Product: Red Hat Directory Server 13.2
Platforms: Unknown
Default status: affected
Package: dirsrv/dirsrv-container-rhel10
Package collection: https://catalog.redhat.com/software/containers/

Red Hat Directory Server 13.2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
1788851765	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Directory Server 12

Vendor: Red Hat
Product: Red Hat Directory Server 12
Platforms: Unknown
Default status: affected
Package: redhat-ds:12/389-ds-base
Package collection: https://access.redhat.com/downloads/content/package-browser/

No explicit version tuples; consult this entry's default status.

Red Hat Directory Server 13

Vendor: Red Hat
Product: Red Hat Directory Server 13
Platforms: Unknown
Default status: unaffected
Package: 389-ds-base
Package collection: https://access.redhat.com/downloads/content/package-browser/

No explicit version tuples; consult this entry's default status.

Red Hat Enterprise Linux 6

Vendor: Red Hat
Product: Red Hat Enterprise Linux 6
Platforms: Unknown
Default status: unaffected
Package: 389-ds-base
Package collection: https://access.redhat.com/downloads/content/package-browser/

No explicit version tuples; consult this entry's default status.