CVE-2026-12528
MEDIUM EPSS 13.2%
Published Jun 17, 20262w ago · Modified Jun 17, 20261w ago
5.4 CVSS 3.1
Published Jun 17, 2026 2w ago
Last Modified Jun 17, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability Low
Threat Intelligence
EPSS Exploit Probability
13.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-787 Out-of-bounds Write Memory Safety
References 3
- access.redhat.com https://access.redhat.com/security/cve/CVE-2026-12528
- bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2489835
- github.com https://github.com/389ds/389-ds-base/pull/7542
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.