🛡️ CVE-2026-12528 — 389-directory-server

🟡 CVSS 5.4 — Medium ✅ No Known Exploit CWE-787 NVD
5.4
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability low.

Weakness class

CVE-2026-12528 is classified as CWE-787: Out-of-bounds Write. Data is written past the end or before the start of a buffer, corrupting whatever is stored there.

Affected software

CVE-2026-12528 is recorded against 3 packages.

  • 389-directory-server
  • directory-server
  • enterprise-linux

Timeline and source

Published on 17 June 2026 and last revised on 28 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

access.redhat.com
bugzilla.redhat.com
github.com

Details

Severity MEDIUM
CVSS Score 5.4
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CWE CWE-787
Public Exploit ✅ No
Source NVD
Published 2026-06-17
Updated 2026-08-11
Modified 2026-06-28

Affected Packages

Software From version Fixed in
389-directory-server — —
directory-server — —
enterprise-linux — —

Similar Threats

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