CVE-2026-11793: Red Hat 389 Directory Server

Medium severity, CVSS 4.9. EPSS: 0.3% chance of exploitation in the next 30 days.

A stack buffer overflow flaw was found in 389 Directory Server. The checkPrefix() function in pw.c copies an attacker-controlled algorithm ID into a 256-byte stack buffer without bounds checking when parsing reversible-encrypted attribute values. An attacker with Directory Manager privileges can crash the LDAP server by storing a crafted credential with an oversized algorithm ID. FORTIFY_SOURCE mitigates this to denial of service only.

Affected products

• Red Hat 389 Directory Server: affected versions not specified

Published 2026-06-09. Last modified 2026-08-07.