CVE-2026-0621

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...

GHSA-8R9Q-7V3J-JR4G Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

Impact A ReDoS vulnerability in the UriTemplate class allows attackers to cause denial of service. The partToRegExp function generates a regex pattern with nested quantifiers ^/+?:,^/+ for exploded template variables e.g., /id, ?tags, causing catastrophic backtracking on malicious input. Who is...

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

Impact A ReDoS vulnerability in the UriTemplate class allows attackers to cause denial of service. The partToRegExp function generates a regex pattern with nested quantifiers ^/+?:,^/+ for exploded template variables e.g., /id, ?tags, causing catastrophic backtracking on malicious input. Who is...

CVE-2026-0621

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...

CVE-2026-0621

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...

CVE-2026-0621

CVE-2026-0621 affects Anthropic’s MCP TypeScript SDK up to v1.25.1. The vulnerability is a ReDoS in the UriTemplate class when processing RFC 6570 exploded array patterns, where the generated regex uses nested quantifiers that can backtrack catastrophically. Exploitation requires sending a crafte...

MCP TypeScript SDK 安全漏洞

MCP TypeScript SDK is a Model Context Protocol open source developer toolkit for Model Context Protocol servers and clients. A security vulnerability exists in MCP TypeScript SDK 1.25.1 and earlier versions, which stems from a regular expression denial of service in the UriTemplate class when...