CVE-2026-18355— 389 Directory Server 数字错误漏洞
一分钟漏洞结论
影响对象
Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
389 Directory Server是389 Directory Server团队开源的一款目录服务器软件。 389 Directory Server (389-ds-base)存在数字错误漏洞，该漏洞源于SASL I/O层对包裹记录长度仅进行上界验证，导致无符号减法下溢和堆缓冲区溢出。远程认证攻击者成功利用此漏洞可导致拒绝服务或远程代码执行。受影响的产品包括Red Hat Directory Server 11版本和12版本，以及Red Hat Enterprise Linux 7版本、8版本、9版
可能的 ATT&CK 技术 1 AI
T1210 · Exploitation of Remote Services影响版本矩阵 23
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一、 漏洞 CVE-2026-18355 基础信息
漏洞信息
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Vulnerability Title
389-ds-base: 389-ds-base: heap buffer overflow via sasl wrapped-record length lower-bound underflow in sasl_io_start_packet()
来源: CVE Program / CVE List V5
Vulnerability 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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
来源: CVE Program / CVE List V5
Vulnerability Title
389 Directory Server 数字错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
389 Directory Server是389 Directory Server团队开源的一款目录服务器软件。 389 Directory Server (389-ds-base)存在数字错误漏洞，该漏洞源于SASL I/O层对包裹记录长度仅进行上界验证，导致无符号减法下溢和堆缓冲区溢出。远程认证攻击者成功利用此漏洞可导致拒绝服务或远程代码执行。受影响的产品包括Red Hat Directory Server 11版本和12版本，以及Red Hat Enterprise Linux 7版本、8版本、9版
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Red Hat | Red Hat Directory Server 11.5 E4S for RHEL 8 | 8060020260908152739.0ca98e7e ~ * |
cpe:/a:redhat:directory_server_e4s:11.5::el8
|
|
| Red Hat | Red Hat Directory Server 11.7 E4S for RHEL 8 | 8080020260903102346.f969626e ~ * |
cpe:/a:redhat:directory_server_e4s:11.7::el8
|
|
| Red Hat | Red Hat Directory Server 11.9 for RHEL 8 | 8100020260904171440.37ed7c03 ~ * |
cpe:/a:redhat:directory_server:11.9::el8
|
|
| Red Hat | Red Hat Directory Server 12.2 E4S for RHEL 9 | 9020020260903155914.1674d574 ~ * |
cpe:/a:redhat:directory_server_e4s:12.2::el9
|
|
| Red Hat | Red Hat Directory Server 12.4 E4S for RHEL 9 | 9040020260903102623.1674d574 ~ * |
cpe:/a:redhat:directory_server_e4s:12.4::el9
|
|
| Red Hat | Red Hat Enterprise Linux 10 | 0:3.2.0-10.el10_2 ~ * |
cpe:/o:redhat:enterprise_linux:10.2
|
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | 0:3.0.6-21.el10_0 ~ * |
cpe:/o:redhat:enterprise_linux_eus:10.0
|
|
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 0:1.3.11.1-15.el7_9 ~ * |
cpe:/o:redhat:rhel_els:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | 8100020260904155442.25e700aa ~ * |
cpe:/a:redhat:enterprise_linux:8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | 8040020260901171549.96015a92 ~ * |
cpe:/a:redhat:rhel_aus:8.4::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | 8040020260901171549.96015a92 ~ * |
cpe:/a:redhat:rhel_aus:8.4::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 8060020260901145727.824efc52 ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | 8060020260901145727.824efc52 ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 8080020260831180218.6dbb3803 ~ * |
cpe:/a:redhat:rhel_e4s:8.8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 8080020260831180218.6dbb3803 ~ * |
cpe:/a:redhat:rhel_e4s:8.8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 9 | 0:2.8.0-10.el9_8 ~ * |
cpe:/a:redhat:enterprise_linux:9::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | 0:2.2.4-22.el9_2 ~ * |
cpe:/a:redhat:rhel_e4s:9.2::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | 0:2.4.5-29.el9_4 ~ * |
cpe:/a:redhat:rhel_e4s:9.4::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | 0:2.6.1-24.el9_6 ~ * |
cpe:/a:redhat:rhel_eus:9.6::appstream
|
|
| Red Hat | Red Hat Directory Server 13.2 | 1788851765 ~ * |
cpe:/a:redhat:directory_server:13.2::el10
|
|
| Red Hat | Red Hat Directory Server 12 | - |
cpe:/a:redhat:directory_server:12
|
|
| Red Hat | Red Hat Directory Server 13 | - |
cpe:/a:redhat:directory_server:13
|
|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
二、漏洞 CVE-2026-18355 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-18355 厂商安全公告 (14)
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🔗 RHSA-2026:64790 - Security Advisory - Red Hat Customer Portal 查看完整文章 vendor-advisory x_refsource_REDHAT
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🔗 RHSA-2026:64791 - Security Advisory - Red Hat Customer Portal 查看完整文章 vendor-advisory x_refsource_REDHAT
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🔗 RHSA-2026:64789 - Security Advisory - Red Hat Customer Portal 查看完整文章 vendor-advisory x_refsource_REDHAT
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🔗 RHSA-2026:64771 - Security Advisory - Red Hat Customer Portal 查看完整文章 vendor-advisory x_refsource_REDHAT
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🔗 RHSA-2026:64804 - Security Advisory - Red Hat Customer Portal 查看完整文章 vendor-advisory x_refsource_REDHAT
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🔗 RHSA-2026:64776 - Security Advisory - Red Hat Customer Portal 查看完整文章 vendor-advisory x_refsource_REDHAT
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🔗 RHSA-2026:64785 - Security Advisory - Red Hat Customer Portal 查看完整文章 vendor-advisory x_refsource_REDHAT
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🔗 RHSA-2026:64783 - Security Advisory - Red Hat Customer Portal 查看完整文章 vendor-advisory x_refsource_REDHAT
CVE-2026-18355 其他参考 (5)
同批安全公告 · Red Hat · 2026-09-07 · 共 10 条
| CVE-2026-18922 | 9.8 CRITICAL | 389 Directory Server 授权问题漏洞 |
| CVE-2026-76578 | 9.8 CRITICAL | FreeIPA 授权问题漏洞 |
| CVE-2026-86404 | 8.8 HIGH | Apache Artemis 反序列化注入漏洞 |
| CVE-2026-19843 | 8.4 HIGH | 389 Directory Server 命令注入漏洞 |
| CVE-2026-79678 | 8.1 HIGH | FreeIPA 代码注入漏洞 |
| CVE-2026-18453 | 7.5 HIGH | 389 Directory Server 异常处理不当漏洞 |
| CVE-2026-76560 | 7.5 HIGH | 389 Directory Server 授权问题漏洞 |
| CVE-2026-86332 | 6.5 MEDIUM | Red Hat OpenShift AI 授权问题漏洞 |
| CVE-2026-86469 | 5.3 MEDIUM | GNOME glib 后置链接漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-18355
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