389-ds-base: 389-ds-base: heap-buffer-overflows in __aclp__normalize_acltxt()
CVSS score
5.4
EPSS probability
—
Risk score
0.5
Published
4 mo ago
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Vulnerability description
DayBreach CVE AI Research
CVE-2026-12528 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
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.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-12528 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Red Hat | Red Hat Directory Server 11 | View |
| 2 | Red Hat | Red Hat Directory Server 12 | View |
| 3 | Red Hat | Red Hat Directory Server 13 | View |
| 4 | Red Hat | Red Hat Enterprise Linux 10 | View |
| 5 | Red Hat | Red Hat Enterprise Linux 6 | View |
| 6 | Red Hat | Red Hat Enterprise Linux 7 | View |
| 7 | Red Hat | Red Hat Enterprise Linux 8 | View |
| 8 | Red Hat | Red Hat Enterprise Linux 9 | View |
| 9 | redhat | directory server | View |
| 10 | redhat | directory server | View |
| 11 | redhat | directory server | View |
| 12 | redhat | 389 directory server | View |
| 13 | redhat | enterprise linux | View |
| 14 | redhat | enterprise linux | View |
| 15 | redhat | enterprise linux | View |
| 16 | redhat | enterprise linux | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 5.4 | CVSS V31 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L | NVD |
| 5.4 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L | CVE CNA |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-12528 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-12528 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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