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fix: validate execution payload bids against parent branch state #9409

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Merged
nflaig merged 3 commits into from
Jun 1, 2026
Merged

fix: validate execution payload bids against parent branch state #9409

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28ffcbd
fix: validate execution payload bids against parent branch state
nflaig May 26, 2026
a225b20
Merge branch 'unstable' into nflaig/bid-validation
nflaig May 28, 2026
741cc8b
Merge branch 'unstable' into nflaig/bid-validation
nflaig May 28, 2026
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28 changes: 23 additions & 5 deletions packages/beacon-node/src/chain/validation/executionPayloadBid.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -35,10 +35,6 @@ async function validateExecutionPayloadBid(
const bid = signedExecutionPayloadBid.message;
const parentBlockRootHex = toRootHex(bid.parentBlockRoot);
const parentBlockHashHex = toRootHex(bid.parentBlockHash);
const state = await chain.getHeadStateAtCurrentEpoch(RegenCaller.validateGossipExecutionPayloadBid);
if (!isStatePostGloas(state)) {
throw new Error(`Expected gloas+ state for execution payload bid validation, got fork=${state.forkName}`);
}

// [IGNORE] `bid.slot` is the current slot or the next slot.
const currentSlot = chain.clock.currentSlot;
Expand Down Expand Up @@ -100,9 +96,31 @@ async function validateExecutionPayloadBid(
});
}

// Use the bid's parent branch state for builder checks
const state = await chain.regen
.getBlockSlotState(parentBlock, bid.slot, {dontTransferCache: true}, RegenCaller.validateGossipExecutionPayloadBid)
.catch(() => {
throw new ExecutionPayloadBidError(GossipAction.IGNORE, {
code: ExecutionPayloadBidErrorCode.UNKNOWN_BLOCK_ROOT,
parentBlockRoot: parentBlockRootHex,
});
});
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if (!isStatePostGloas(state)) {
throw new Error(`Expected gloas+ state for execution payload bid validation, got fork=${state.forkName}`);
}

// [REJECT] `bid.builder_index` is a valid/active builder index -- i.e.
// `is_active_builder(state, bid.builder_index)` returns `True`.
const builder = state.getBuilder(bid.builderIndex);
let builder: gloas.Builder;
try {
builder = state.getBuilder(bid.builderIndex);
} catch {
throw new ExecutionPayloadBidError(GossipAction.REJECT, {
code: ExecutionPayloadBidErrorCode.BUILDER_NOT_ELIGIBLE,
builderIndex: bid.builderIndex,
});
}
if (!isActiveBuilder(builder, state.finalizedCheckpoint.epoch)) {
throw new ExecutionPayloadBidError(GossipAction.REJECT, {
code: ExecutionPayloadBidErrorCode.BUILDER_NOT_ELIGIBLE,
Expand Down
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