Vulnerability · Published Jun 9, 2026 · Assigned by redhat
CVE-2026-11793389-ds-base: 389-ds-base: stack buffer overflow in checkprefix() algorithm id parsing
Medium 4.9
In plain English
A medium-severity stack buffer overflow in Red Hat Directory Server 11 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | 389-ds-base | no fix listed | DEBIAN-CVE-2026-11793 |
| Debian:13 | 389-ds-base | no fix listed | DEBIAN-CVE-2026-11793 |
| Ubuntu:22.04:LTS | 389-ds-base | no fix listed | UBUNTU-CVE-2026-11793 |
| Ubuntu:24.04:LTS | 389-ds-base | no fix listed | UBUNTU-CVE-2026-11793 |
| Ubuntu:25.10 | 389-ds-base | no fix listed | UBUNTU-CVE-2026-11793 |
| Ubuntu:26.04:LTS | 389-ds-base | no fix listed | UBUNTU-CVE-2026-11793 |
| Ubuntu:26.10 | 389-ds-base | no fix listed | UBUNTU-CVE-2026-11793 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Directory Server 11 | see references |
| Red Hat | Red Hat Directory Server 12 | see references |
| Red Hat | Red Hat Directory Server 13 | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-11793 vdb-entry, x_refsource_REDHAT
- RHBZ#2484914 issue-tracking, x_refsource_REDHAT