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...

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...

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...

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...