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Vulnerabilities

CVE-2026-0621

High ⚡ Exploit Available
ReDoS Vulnerability in Anthropic MCP TypeScript SDK URI Template Processing
CWE-1333 — Weakness Type
Published: Jan 5, 2026  ·  Modified: Feb 28, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

Anthropic's MCP TypeScript SDK versions up to and including 1.25.1 contain a regular expression denial of service (ReDoS) vulnerability in the UriTemplate class when processing RFC 6570 exploded array patterns. The dynamically generated regular expression used during URI matching contains nested quantifiers that can trigger catastrophic backtracking on specially crafted inputs, resulting in excessive CPU consumption. An attacker can exploit this by supplying a malicious URI that causes the Node.js process to become unresponsive, leading to a denial of service.

🤖 AI Executive Summary

Anthropic's MCP TypeScript SDK versions up to 1.25.1 contain a ReDoS vulnerability in the UriTemplate class that processes RFC 6570 exploded array patterns, allowing attackers to cause denial of service through catastrophic regex backtracking. Exploitation requires supplying a malicious URI that triggers excessive CPU consumption and process unresponsiveness.

📄 Description (Arabic)

تحتوي مجموعة أدوات Anthropic MCP TypeScript على ثغرة رفض الخدمة (ReDoS) في فئة UriTemplate عند معالجة أنماط المصفوفات المفصولة وفقاً لمعيار RFC 6570. يمكن للمهاجمين استغلال هذه الثغرة بإرسال URI ضار يسبب ارتجاعاً عكسياً كارثياً في التعبير النمطي، مما يؤدي إلى استهلاك مفرط لموارد المعالج وتعطل الخدمة. هذا يؤثر على جميع التطبيقات التي تستخدم الإصدارات المتأثرة من SDK.

🤖 ملخص تنفيذي (AI)

مجموعة أدوات MCP TypeScript من Anthropic الإصدارات حتى 1.25.1 تحتوي على ثغرة ReDoS في فئة UriTemplate التي تعالج أنماط المصفوفات المفصولة RFC 6570، مما يسمح للمهاجمين بإحداث رفض الخدمة من خلال الارتجاع العكسي للتعبير النمطي الكارثي. يتطلب الاستغلال توفير URI ضار يؤدي إلى استهلاك CPU مفرط وعدم استجابة العملية.

🤖 AI Intelligence Analysis Analyzed: May 3, 2026 17:19
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: medium
🏢 Affected Saudi Sectors
telecom government banking healthcare
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
7.0
/ 10.0
🔧 Remediation Steps (English)
Upgrade Anthropic MCP TypeScript SDK to version 1.25.2 or later immediately. Review and validate all URI inputs processed by the UriTemplate class. Implement input validation and sanitization for RFC 6570 URI patterns. Monitor Node.js process CPU usage for anomalies indicating ReDoS attacks. Consider implementing rate limiting on URI processing endpoints.
🔧 خطوات المعالجة (العربية)
قم بترقية مجموعة أدوات Anthropic MCP TypeScript إلى الإصدار 1.25.2 أو أحدث على الفور. راجع وتحقق من صحة جميع مدخلات URI التي تعالجها فئة UriTemplate. تنفيذ التحقق من صحة المدخلات والتنظيف لأنماط URI RFC 6570. مراقبة استخدام CPU لعملية Node.js للكشف عن الحالات الشاذة التي تشير إلى هجمات ReDoS. فكر في تنفيذ تحديد معدل على نقاط نهاية معالجة URI.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC-2.1 ECC-2.2
🔵 SAMA CSF
CC-6.1 CC-6.2
🟡 ISO 27001:2022
A.12.6.1 A.14.2.1
📦 Affected Products / CPE 1 entries
lfprojects:mcp_typescript_sdk
📊 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-1333
EPSS0.02%
Exploit ✓ Yes
Patch ✓ Yes
Published 2026-01-05
Source Feed nvd
Views 5
🇸🇦 Saudi Risk Score
7.0
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
exploit-available CWE-1333
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