CVE-2026-18355

CVE CVE-2026-18355EUVD EUVD-2026-72455Published 2026-09-07T14:14:43.000ZLast changed 2026-09-08T21:58:57.000ZCVSS 7.5

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Red Hat — Red Hat Directory Server 11.7 E4S for RHEL 8 patch: 8080020260903102346.f969626e
• Red Hat — Red Hat Directory Server 11.9 for RHEL 8 patch: 8100020260904171440.37ed7c03
• Red Hat — Red Hat Directory Server 12.2 E4S for RHEL 9 patch: 9020020260903155914.1674d574
• Red Hat — Red Hat Directory Server 12.4 E4S for RHEL 9 patch: 9040020260903102623.1674d574
• Red Hat — Red Hat Directory Server 13.2 patch: 1788851765
• Red Hat — Red Hat Enterprise Linux 10 patch: 0:3.2.0-10.el10_2
• Red Hat — Red Hat Enterprise Linux 10.0 Extended Update Support patch: 0:3.0.6-21.el10_0
• Red Hat — Red Hat Enterprise Linux 7 Extended Lifecycle Support patch: 0:1.3.11.1-15.el7_9
• Red Hat — Red Hat Enterprise Linux 8 patch: 8100020260904155442.25e700aa
• Red Hat — Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support patch: 8040020260901171549.96015a92
• Red Hat — Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On patch: 8040020260901171549.96015a92
• Red Hat — Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support patch: 8060020260901145727.824efc52
• Red Hat — Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On patch: 8060020260901145727.824efc52
• Red Hat — Red Hat Enterprise Linux 8.8 Telecommunications Update Service patch: 8080020260831180218.6dbb3803
• Red Hat — Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions patch: 8080020260831180218.6dbb3803
• Red Hat — Red Hat Enterprise Linux 9 patch: 0:2.8.0-10.el9_8
• Red Hat — Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions patch: 0:2.2.4-22.el9_2
• Red Hat — Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions patch: 0:2.4.5-29.el9_4
• Red Hat — Red Hat Enterprise Linux 9.6 Extended Update Support patch: 0:2.6.1-24.el9_6

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Red Hat — Red Hat Enterprise Linux

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.