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Vulnerabilities

CVE-2026-41292

High
CWE-407 — Weakness Type
Published: May 20, 2026  ·  Modified: May 27, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).

🤖 AI Executive Summary

NLnet Labs Unbound versions up to 1.25.0 are vulnerable to denial of service attacks through maliciously crafted DNS queries containing excessive EDNS options that consume server resources. Attackers can degrade or completely disable DNS resolution services by sending coordinated requests with too many EDNS options, affecting all dependent systems.

📄 Description (Arabic)

ثغرة في NLnet Labs Unbound تسمح للمهاجمين بإرسال استعلامات DNS تحتوي على عدد كبير جداً من خيارات EDNS (Extension Mechanisms for DNS)، مما يؤدي إلى استهلاك موارد الخادم وتعطل الخيوط. يمكن للهجمات المنسقة أن تؤدي إلى تدهور أداء خدمة DNS أو حجبها بالكامل، مما يؤثر على جميع الأنظمة التي تعتمد عليها.

🤖 ملخص تنفيذي (AI)

خادم NLnet Labs Unbound الإصدارات حتى 1.25.0 عرضة لهجمات حجب الخدمة من خلال استعلامات DNS مصممة بشكل خبيث تحتوي على خيارات EDNS مفرطة تستهلك موارد الخادم. يمكن للمهاجمين تقليل أداء أو تعطيل خدمات حل أسماء النطاقات بالكامل من خلال إرسال طلبات منسقة تحتوي على عدد كبير جداً من خيارات EDNS.

🤖 AI Intelligence Analysis Analyzed: May 21, 2026 23:40
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: high
🏢 Affected Saudi Sectors
government telecom banking energy healthcare
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
8.0
/ 10.0
🔧 Remediation Steps (English)
Immediately upgrade NLnet Labs Unbound to version 1.25.1 or later which implements a limit of 100 acceptable incoming EDNS options. For organizations unable to upgrade immediately, implement network-level rate limiting and traffic filtering to restrict DNS queries with excessive EDNS options, and monitor DNS server resource utilization for anomalous patterns.
🔧 خطوات المعالجة (العربية)
قم بترقية NLnet Labs Unbound فوراً إلى الإصدار 1.25.1 أو أحدث الذي يطبق حداً أقصى بـ 100 خيار EDNS مقبول. بالنسبة للمنظمات غير القادرة على الترقية فوراً، طبق تحديد معدل على مستوى الشبكة وتصفية حركة المرور لتقييد استعلامات DNS ذات خيارات EDNS المفرطة، وراقب استخدام موارد خادم DNS للأنماط الشاذة.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.12.6.1 A.13.1.1 A.13.2.1
🔵 SAMA CSF
ID.BE-5 PR.DS-4 DE.CM-1
🟡 ISO 27001:2022
A.12.6.1 A.13.1.1 A.13.2.1 A.13.2.4
📦 Affected Products / CPE 1 entries
nlnetlabs:unbound
📊 CVSS Score
7.5
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityN — None / Network
IntegrityN — None / Network
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.5
CWECWE-407
EPSS0.08%
Exploit No
Patch ✗ No
Published 2026-05-20
Source Feed nvd
🇸🇦 Saudi Risk Score
8.0
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-407
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