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What Is the Primary Security Assumption for an SPV Client?

The primary security assumption is that the majority of the network's full nodes are honest and will not collude to present a false block header with a tampered Merkle Root. An SPV client trusts the block header it receives from a full node, relying on the difficulty of the PoW to secure that header's integrity against fraudulent inclusion of a transaction.

Why Is SPV Less Suitable for Verifying the Full State of a Smart Contract Platform?
What Is the Fundamental Difference between a Full Node and an SPV Client in a Blockchain Network?
What Is the Specific Threat Known as a “Fork Attack” in the Context of SPV?
What Is the Role of the “Bloom Filter” in Enabling SPV Clients to Request Relevant Data?