389-ds-base: 389-ds-base: pre-authentication double-free in get_ldapmessage_controls_ext() via critical session tracking control
CVSS score
5.9
EPSS probability
%0.5
Risk score
0.0
Published
2 mo ago
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Impact on My Inventory
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
A double-free vulnerability in 389-ds-base allows unauthenticated remote attackers to trigger heap corruption via a critical Session Tracking control in a BIND request, leading to potential denial of service. Affected products include Red Hat Directory Server 11-13 and RHEL 6-9. Patch status is UNKNOWN due to lack of vendor confirmation. No fixed version is specified.
This vulnerability enables remote attackers to cause denial of service without authentication, affecting widely deployed Red Hat Directory Server and RHEL products. Without a confirmed patch, organizations remain exposed to potential service disruption.
What should be done?
- No fixed version available
- Patch status is UNKNOWN
- Follow vendor advisory for updates
Chain of evidence and sources
389-ds-base'da bir iki kez serbest bırakma (double-free) eksikliği, bir BIND isteğiyle kritik bir Session Tracking kontrolüyle, uzak ve kimlik doğrulama olmadan tetiklenebilir ve heap bozulması ve potansiyel hizmet kesintisi sonucu ortaya çıkabilir.
Eksiklik, Red Hat Directory Server 11, 12, 13 ve Red Hat Enterprise Linux 6 ile 9 arasında etkilenir; mevcut verilerde belirtilen bir düzeltme sürümü yoktur.
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Show the technical text from the sources
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function frees the parsed controls array on the Session Tracking critical-control rejection path without clearing the SLAPI_REQCONTROLS pblock slot. Operation teardown then frees the same pointer again, causing a double-free. An unauthenticated remote attacker can trigger this with a single BIND request carrying a critical Session Tracking control, resulting in heap corruption and potential denial of service.
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-415
Explanation produced with the local qwen3:4b-instruct model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-18663 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 |
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 |
|---|---|---|---|---|
| 5.9 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | CVE CNA |
| 5.9 | CVSS V31 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD |
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-2026-18663 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-2026-18663 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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