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CVE-2026-11793— 389-ds-base: 389-ds-base: stack buffer overflow in checkprefix() algorithm id parsing

Quick assessment

Affected
Red Hat Red Hat Directory Server 11
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

389 Directory Server是389 Directory Server开源的一个高度可用、功能齐全、可靠和安全的LDAP服务器实现。 389 Directory Server存在安全漏洞，该漏洞源于pw.c中的checkPrefix函数在解析可逆加密属性值时，将攻击者控制的算法ID复制到256字节栈缓冲区而未进行边界检查，导致具有目录管理器权限的攻击者通过存储带有超大算法ID的特制凭据崩溃LDAP服务器。

CVSS 4.9 · Medium EPSS 0.28% · P19

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat Directory Server 11 any affected
Red Hat Red Hat Directory Server 12 any affected
Red Hat Red Hat Directory Server 13 any affected
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-11793

Vulnerability Information
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Vulnerability Title
389-ds-base: 389-ds-base: stack buffer overflow in checkprefix() algorithm id parsing
Source: CVE Program / CVE List V5
Vulnerability Description
A stack buffer overflow flaw was found in 389 Directory Server. The checkPrefix() function in pw.c copies an attacker-controlled algorithm ID into a 256-byte stack buffer without bounds checking when parsing reversible-encrypted attribute values. An attacker with Directory Manager privileges can crash the LDAP server by storing a crafted credential with an oversized algorithm ID. FORTIFY_SOURCE mitigates this to denial of service only.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
389 Directory Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
389 Directory Server是389 Directory Server开源的一个高度可用、功能齐全、可靠和安全的LDAP服务器实现。 389 Directory Server存在安全漏洞，该漏洞源于pw.c中的checkPrefix函数在解析可逆加密属性值时，将攻击者控制的算法ID复制到256字节栈缓冲区而未进行边界检查，导致具有目录管理器权限的攻击者通过存储带有超大算法ID的特制凭据崩溃LDAP服务器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Directory Server 11 - cpe:/a:redhat:directory_server:11
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 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-11793

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III. Intelligence Information for CVE-2026-11793

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Vendor Advisories for CVE-2026-11793 (3)

Same Patch Batch · Red Hat · 2026-06-09 · 9 CVEs total

CVE-2026-11788 5.9 MEDIUM 389-ds-base: 389-ds-base: null pointer dereference in deref control plugin ber parser
CVE-2026-11787 5.0 MEDIUM 389-ds-base: 389-ds-base: heap buffer over-read in ldap_utf8prev() via str2simple filter p
CVE-2026-11790 4.9 MEDIUM 389-ds-base: 389-ds-base: pbkdf2 password storage plugin unbounded iteration count denial
CVE-2026-11789 4.9 MEDIUM 389-ds-base: 389-ds-base: smd5 password storage plugin salt length integer underflow crash
CVE-2026-52902 4.7 MEDIUM Awxkit: path traversal via yaml !include directive
CVE-2026-11785 4.3 MEDIUM 389-ds-base: 389-ds-base: partial stack address information leak via ber_printf type confu
CVE-2026-11792 3.3 LOW 389-ds-base: 389-ds-base: heap buffer overflow in audit log password masking (create_maske
CVE-2026-11786 1.9 LOW 389-ds-base: 389-ds-base: heap out-of-bounds read in ldif parser str2entry_state_informati

IV. Related Vulnerabilities

Same product: Red Hat Directory Server 11
Same vendor: Red Hat
Same weakness: CWE-121

V. Comments for CVE-2026-11793

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