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2 vulnerabilities found for MCP TypeScript SDK by Anthropic

CVE-2026-0621 (GCVE-0-2026-0621)

Vulnerability from cvelistv5 – Published: 2026-01-05 20:57 – Updated: 2026-01-05 21:48
VLAI?
Title
MCP TypeScript SDK UriTemplate Exploded Array Pattern ReDoS
Summary
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.
Severity ?
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
Vendor Product Version
Anthropic MCP TypeScript SDK Affected: 0 , ≤ 1.25.1 (semver)
Create a notification for this product.
Credits
Weblover
Show details on NVD website
To clipboard 

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CVE-2026-0621 (GCVE-0-2026-0621)

Vulnerability from nvd – Published: 2026-01-05 20:57 – Updated: 2026-01-05 21:48
VLAI?
Title
MCP TypeScript SDK UriTemplate Exploded Array Pattern ReDoS
Summary
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.
Severity ?
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
Vendor Product Version
Anthropic MCP TypeScript SDK Affected: 0 , ≤ 1.25.1 (semver)
Create a notification for this product.
Credits
Weblover
Show details on NVD website
To clipboard 

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