Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A heap buffer overflow exists in 389 Directory Server's audit log password masking feature. The create_masked_entry_string() function (auditlog.c:109) uses strcpy to write a fixed 24-byte mask string into a precisely-sized heap buffer from slapi_entry2str(). When a password value is shorter than 23 characters, the copy overflows past the allocated buffer boundary.

Trigger conditions require non-default configuration: audit logging enabled AND either passwordStorageScheme=CLEAR (explicitly discouraged) or a compromised replication peer sending short cleartext passwords via replicated ADD (repl_op bypasses password hashing).

Introduced by commit bfeaa8d (Issue 6884, July 2025) and backported to RHEL 9.6 (RHEL-109954) and RHEL 10 (RHEL-107035). Not present in RHEL 7, RHEL 8, or RHEL 9.0-9.5.

Production testing: heap corruption confirmed in audit log output on live server; ASan PoC confirms overflow. Production binaries may absorb overflow in allocator padding without immediate crash.

Advisory: 389-ds-campaign-2026-04/006-Auditlog-Heap-Overflow/advisory.md. Source: PSIRTSUPT-7600 (Ian Murphy, Red Hat Product Security).