{"data":{"id":"6dbf5513-c677-45c5-b923-acaa99b97802","title":"Spa: Stealthy and Persistent Backdoor Attacks in Federated Learning via Feature-Space Alignment","summary":"Researchers propose Spa, a backdoor attack framework for federated learning that aims to be both stealthy and persistent. Instead of training a conflicting secondary task, Spa uses feature-space alignment to fold backdoor features into the primary objective, and it uses adversarial dynamic trigger optimization that co-evolves with the global model. Experiments report attack success rates near 100% with minimal utility loss, and the backdoor stays effective around 900 FL rounds after attacks stop.","solution":"N/A -- no mitigation discussed in source.","labels":["security","research"],"sourceUrl":"http://ieeexplore.ieee.org/document/11612917","publishedAt":"2026-07-17T13:19:11.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":["model_poisoning"],"issueType":"research","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":[],"affectedVendorsRaw":[],"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":"2026-07-17T13:19:11.000Z","fixReleasedAt":null,"daysToFix":null,"fixCheckedAt":null,"capecIds":null,"crossRefCount":0,"attackSophistication":"advanced","impactType":["integrity","safety"],"aiComponentTargeted":"model","llmSpecific":false,"classifierConfidence":0.95,"researchCategory":"peer_reviewed","atlasIds":null}}