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NVD / CVE Program· CNA redhat

CVE-2026-12528: 389-ds-base: 389-ds-base: heap-buffer-overflows in __aclp__normalize_acltxt()

MediumCVSS 5.4 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: 389-ds (openSUSE:Leap 16.0) 3.0.6~git382.7a51ea5f5-160000.1.1; 389-ds (openSUSE:Tumbleweed) 3.2.2+4b41542b2-1.1; 389-ds (SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS) 2.2.10~git255.752643c78-150500.3.48.1.

Low priority for now. Upgrade to 389-ds (openSUSE:Leap 16.0) 3.0.6~git382.7a51ea5f5-160000.1.1; 389-ds (openSUSE:Tumbleweed) 3.2.2+4b41542b2-1.1; 389-ds (SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS) 2.2.10~git255.752643c78-150500.3.48.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Jun 17, 2026
Updated
Nov 6, 2026
EPSS
0.2% · 13th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.4
CNA · redhat
5.4
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-12528

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
redhatdirectory server
redhat389 directory server
redhatenterprise linux

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Directory Server 11

    • all versionsaffected

  • Red Hat Red Hat Directory Server 12

    • all versionsaffected

  • Red Hat Red Hat Directory Server 13

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsaffected
Affected versions · NVD (8)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • redhat 389 directory serverall versions
  • redhat directory server11.0
  • redhat directory server12.0
  • redhat directory server13.0
  • redhat enterprise linux10.0
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12389-ds-basefrom 0—
openSUSE:Leap 16.0389-dsbefore 3.0.6~git382.7a51ea5f5-160000.1.13.0.6~git382.7a51ea5f5-160000.1.1
openSUSE:Tumbleweed389-dsbefore 3.2.2+4b41542b2-1.13.2.2+4b41542b2-1.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS389-dsbefore 2.2.10~git255.752643c78-150500.3.48.12.2.10~git255.752643c78-150500.3.48.1
SUSE:Linux Enterprise Module for Server Applications 15 SP7389-dsbefore 2.7.0~git212.9b0755edb-150700.3.19.12.7.0~git212.9b0755edb-150700.3.19.1
SUSE:Linux Enterprise Server 15 SP6-LTSS389-dsbefore 2.2.10~git255.752643c78-150600.8.32.12.2.10~git255.752643c78-150600.8.32.1
SUSE:Linux Enterprise Server 16.0389-dsbefore 3.0.6~git382.7a51ea5f5-160000.1.13.0.6~git382.7a51ea5f5-160000.1.1

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2008-2928Multiple buffer overflows in the adminutil library in CGI applications in Red Hat Directory Server 7.1 before SP7 allow remote attackers to…
    42Plan
  • CVE-2008-0892The replication monitor CGI script (repl-monitor-cgi.pl) in Red Hat Administration Server, as used by Red Hat Directory Server 8.0 EL4 and…
    40Plan
  • CVE-2008-1677Buffer overflow in the regular expression handler in Red Hat Directory Server 8.0 and 7.1 before SP6 allows remote attackers to cause a…
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-11789Jun 9, 2026 · 389-ds-base: 389-ds-base: smd5 password storage plugin salt length integer underflow crash
    26Monitor
  • ← EarlierCVE-2026-11790Jun 9, 2026 · 389-ds-base: 389-ds-base: pbkdf2 password storage plugin unbounded iteration count denial of service
    19Monitor
  • Later →CVE-2026-11791Jun 18, 2026 · 389-ds-base: 389-ds-base: use-after-free in schema reload via attr_syntax_swap_ht()
    20Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
opensuse:389-ds3.2.2+4b41542b2-1.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:389-ds3.0.6~git382.7a51ea5f5-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Not on record for this CVE: EPSS history · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records