{"data":{"id":"3b377d28-3dca-4abd-89f7-090912c0c34b","title":"Jev as a judge: How counterfeit policy steers Jev","summary":"TypeSafe AI introduced Jev on September 15 as the first of its System One Models, which return structured decisions in parallel instead of generating text token by token. This post evaluates Jev's prompt injection detection and tests whether attacker-controlled content can steer its classifications to bypass LangChain's tool-risk gating.","solution":"N/A -- no mitigation discussed in source.","labels":["security","research"],"sourceUrl":"\n    https://securitylabs.datadoghq.com/articles/jev-as-a-judge-how-counterfeit-policy-steers-jev/","publishedAt":"2026-10-15T00:00:00.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"low","attackType":["prompt_injection","jailbreak"],"issueType":"news","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":["LangChain"],"affectedVendorsRaw":["Jev","TypeSafe AI","LangChain","entagl","Vercel eve"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"epssCheckedAt":null,"kevDateAdded":null,"advisoryAliases":null,"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":null,"disclosureDate":"2026-10-15T00:00:00.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["integrity","safety"],"aiComponentTargeted":"agent","llmSpecific":true,"classifierConfidence":0.9,"researchCategory":null,"atlasIds":["AML.T0051","AML.T0054"]}}