Description
A flaw was found in the 389-ds-base server. A heap buffer overflow vulnerability exists in the `schema_attr_enum_callback` function within the `schema.c` file. This occurs because the code incorrectly calculates the buffer size by summing alias string lengths without accounting for additional formatting characters. When a large number of aliases are processed, this oversight can lead to a heap overflow, potentially allowing a remote attacker to cause a Denial of Service (DoS) or achieve Remote Code Execution (RCE).
References10
- access.redhat.com/errata/RHSA-2026:3189
- access.redhat.com/errata/RHSA-2026:3208
- access.redhat.com/errata/RHSA-2026:3379
- access.redhat.com/errata/RHSA-2026:3504
- access.redhat.com/errata/RHSA-2026:4207
- access.redhat.com/errata/RHSA-2026:4661
- access.redhat.com/errata/RHSA-2026:4720
- access.redhat.com/errata/RHSA-2026:5196
- access.redhat.com/errata/RHSA-2026:5511
- access.redhat.com/errata/RHSA-2026:5512
Metrics
- CVSS 3.1
-
7.2
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 71 · as of 12 November 2026
- CWE
- CWE-122
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.