Vulnerability Details CVE-2026-12528
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 13.2%
CVSS Severity
CVSS v3 Score 5.4
References
Products affected by CVE-2026-12528
-
cpe:2.3:a:redhat:directory_server:11.0
-
cpe:2.3:a:redhat:directory_server:12.0
-
cpe:2.3:a:redhat:directory_server:13.0
-
cpe:2.3:o:redhat:389_directory_server:-
-
cpe:2.3:o:redhat:enterprise_linux:10.0
-
cpe:2.3:o:redhat:enterprise_linux:7.0
-
cpe:2.3:o:redhat:enterprise_linux:8.0
-
cpe:2.3:o:redhat:enterprise_linux:9.0