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OLPC/LABUBU PancakeSwap V2 Pool — Reserve Desync Drain

Incident date June 20, 2026

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ActiveBNB Chain → EthereumAMM logic exploit / reserve desynchronizationCluster: OLPC-AMM-2026-06

Estimated loss

$1.1M

Victims identified

more than ten victims identified
Victim group joining is coming soon.

Investigation

100%

Facts and investigation

Attacker: 0x18D6c39aE9E537F948AA2212d44D8c23944fc188 (confirmed via on-chain logs and @exvulsec, June 20, 2026)

Funds moved to: Attacker exited via LABUBU/WBNB and WBNB/USDT routing pools into 1,115,903.66 USDT (~$1,114,278.91), all received directly at attacker address 0x18D6c39a...3944fc188. Funds then bridged to Ethereum; 633.4 ETH deposited into Tornado Cash; small dust amounts (0.0411 ETH + 0.0221 BNB) sent to the dead address to obscure trail. Exploit transaction: 0x8dabb60a94e5124462e5f494a25c14bcd52f6f4d1f7c665a249496f4c6c24764. Intermediate fund-flow addresses observed: 0x5DB85D56...5BF555cc0 (received ~688K LAB
OLPC token contract: 0x58815cdf9955121a6274680ab396a36fc9e00000. LABUBU token contract: 0x3494dfe19b721dac6c5c8d7470c8f89548177777. Drained pool (PancakeSwap V2, OLPC/LABUBU): 0xedB7DCB4cDFEc957F8Df5cBf5E94229a6CC9F365. Routing pool 1 (LABUBU/WBNB): 0xdfACdC33e913710eaD31eE40f9C5363Ea673C421. Routing pool 2 (WBNB/USDT): 0x16b9a82891338f9bA80e2D6970FdDa79D1eb0daE. PancakeSwap publicly confirmed its own V2 contracts were not vulnerable; the flaw was specific to the OLPC token's burn-on-transfer me

Timeline: T-46 days (~early May 2026): OLPC token owner alters the token's decimalsValue parameter and renounces ownership, planting a dormant trap. T0 (June 20, 2026, block 105326393, tx 0x8dabb60a94e5124462e5f494a25c14bcd52f6f4d1f7c665a249496f4c6c24764): Attacker contract 0x18D6c39a...3944fc188 sends a ~10 OLPC transfer through itself, which triggers a cascading sequence of LABUBU burns to the dead address (0x000...dEaD) from the OLPC/LABUBU pair, while the pair's cached AMM reserves are not resynced to the real, collapsed token balance. T0+seconds: Attacker exploits the mispriced pair, sweeping LABUBU at far below real cost and routing it through LABUBU/WBNB and WBNB/USDT pools. T0+minutes: Exit completed with 1,115,903.66 USDT (~$1,114,278.91) landing directly in the attacker's wallet. T+same day: PeckShieldAlert and @exvulsec publish technical alerts on X (June 20, 2026), confirming the vector as a deflationary/burn-on-transfer desync of a constant-product pair. PancakeSwap publicly states its own contracts were unaffected. T+same day: Attacker bridges proceeds to Ethereum and deposits 633.4 ETH into Tornado Cash. Status: no recovery, no patch possible (OLPC ownership renounced, contract immutable).

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