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CVE PROGRAM SOURCE RECORD7.5 High

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()

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Status
Published
Published
Updated
Assigning organization
redhat

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8

Default version status: affected

  • 8060020260908152739.0ca98e7e to < *unaffected

Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8

Default version status: affected

  • 8080020260903102346.f969626e to < *unaffected

Red Hat Red Hat Directory Server 11.9 for RHEL 8

Default version status: affected

  • 8100020260904171440.37ed7c03 to < *unaffected

Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9

Default version status: affected

  • 9020020260903155914.1674d574 to < *unaffected

Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9

Default version status: affected

  • 9040020260903102623.1674d574 to < *unaffected

Red Hat Red Hat Enterprise Linux 10

Default version status: affected

  • 0:3.2.0-10.el10_2 to < *unaffected

Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

Default version status: affected

  • 0:3.0.6-21.el10_0 to < *unaffected

Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support

Default version status: affected

  • 0:1.3.11.1-15.el7_9 to < *unaffected

Red Hat Red Hat Enterprise Linux 8

Default version status: affected

  • 8100020260904155442.25e700aa to < *unaffected

Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Default version status: affected

  • 8040020260901171549.96015a92 to < *unaffected

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

Default version status: affected

  • 8040020260901171549.96015a92 to < *unaffected

Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Default version status: affected

  • 8060020260901145727.824efc52 to < *unaffected

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

Default version status: affected

  • 8060020260901145727.824efc52 to < *unaffected

Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Default version status: affected

  • 8080020260831180218.6dbb3803 to < *unaffected

Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Default version status: affected

  • 8080020260831180218.6dbb3803 to < *unaffected

Red Hat Red Hat Enterprise Linux 9

Default version status: affected

  • 0:2.8.0-10.el9_8 to < *unaffected

Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Default version status: affected

  • 0:2.2.4-22.el9_2 to < *unaffected

Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Default version status: affected

  • 0:2.4.5-29.el9_4 to < *unaffected

Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support

Default version status: affected

  • 0:2.6.1-24.el9_6 to < *unaffected

Red Hat Red Hat Directory Server 13.2

Default version status: affected

  • 1788851765 to < *unaffected

Red Hat Red Hat Directory Server 12

Default version status: affected

Red Hat Red Hat Directory Server 13

Default version status: unaffected

Red Hat Red Hat Enterprise Linux 6

Default version status: unaffected

References