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.
CVSS 4.0HIGH 8.7·Network·No auth·No interaction·EPSS 0.00438·Published 2026-01-05·Fixed in 1.25.2CWE-1333