CVE-2026-12528

Published Jun 17, 2026

Last updated 2 days ago

CVSS medium 5.4

Overview

Description
A flaw was found in 389 Directory Server in the __aclp__normalize_acltxt() function of aclparse.c. A malformed ACI (Access Control Instruction) string can trigger heap-buffer-overflow writes and reads during ACI parsing. The function fails to validate that the ACI keyword has sufficient length after whitespace stripping, leading to a 1-byte out-of-bounds write and subsequent out-of-bounds reads. An authenticated user with write access to the aci attribute could send a crafted ACI value to silently corrupt heap memory in the directory server process.
Source
secalert@redhat.com
NVD status
Analyzed
Products
directory_server, 389_directory_server, enterprise_linux

Risk scores

CVSS 3.1

Type
Primary
Base score
5.4
Impact score
2.5
Exploitability score
2.8
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Severity
MEDIUM

Weaknesses

secalert@redhat.com
CWE-787

Social media

Hype score
Not currently trending

Configurations

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References

Sources include official advisories and independent security research.