{"data":{"id":"769ae8f1-ed4a-47c9-abd2-a21127814a40","title":"CVE-2026-0621: Anthropic's MCP TypeScript SDK versions up to and including 1.25.1 contain a regular expression denial of service (ReDoS","summary":"Anthropic's MCP TypeScript SDK (a toolkit for building AI applications) versions up to 1.25.1 has a ReDoS vulnerability (regular expression denial of service, where a maliciously designed input causes the regex parser to work extremely hard and freeze the system) in its UriTemplate class. An attacker can send a specially crafted URI (web address) that makes the Node.js process (the JavaScript runtime environment) consume excessive CPU and stop responding, causing the application to crash or become unavailable.","solution":"N/A -- no mitigation discussed in source.","labels":["security"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-0621","publishedAt":"2026-01-06T02:16:14.533Z","cveId":"CVE-2026-0621","cweIds":["CWE-1333"],"cvssScore":"7.5","cvssSeverity":"high","severity":"high","attackType":["denial_of_service"],"issueType":"vulnerability","affectedPackages":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Anthropic","MCP TypeScript SDK"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":"unknown","epssScore":0.00022,"patchAvailable":null,"disclosureDate":null,"capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["availability"],"aiComponentTargeted":"api","llmSpecific":true,"classifierConfidence":0.95,"researchCategory":null,"atlasIds":null}}