Description
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.
INFO
Published Date :
2026-01-05T20:57:14.515Z
Last Modified :
2026-03-05T01:30:05.626Z
Source :
VulnCheck
AFFECTED PRODUCTS
The following products are affected by CVE-2026-0621 vulnerability.
| Vendors | Products |
|---|---|
| Anthropic |
|
| Lfprojects |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-0621.
