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CVE-2026-12528

389-ds-base: 389-ds-base: heap-buffer-overflows in __aclp__normalize_acltxt()

Published: Jun 17, 2026Updated: Jun 17, 2026 Sources: CVE List NVDCWE-787
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.2%
Top 86.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-787

Affected Products

Red Hat Directory Server 11Red Hat
On-prem
Operating Systems / linux-distro
Red Hat Directory Server 12Red Hat
On-premDatabase
Databases / relational
Red Hat Directory Server 13Red Hat
On-prem
Operating Systems / linux-distro
Red Hat Enterprise Linux 10Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 6Red Hat
On-premOS
Operating Systems / linux-distro
red hatcommercialUSOperating Systemsaka red hat
and 3 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Workaround Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://access.redhat.com/security/cve/CVE-2026-12528
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2489835
bugzilla.redhat.com
https://github.com/389ds/389-ds-base/pull/7542
github.com

Timeline

Published
Jun 17, 2026
Last Updated
Jun 17, 2026

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