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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: 2026-03-05 01:30
    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
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    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: 2026-03-05 01:30
    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
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    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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