medium5.4
CVE-2026-12528
A flaw was found in 389 Directory Server in the __aclp__normalize_acltxt() function of aclparse.c.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Redhat | Directory Server | Versions 11.0, 12.0, 13.0 |
| Redhat | 389 Directory Server | All versions |
| Redhat | Enterprise Linux | Versions 7.0, 8.0, 9.0, 10.0 |