MANTRA's Blockchain Stays Halted After an Upstream Dependency Exploit

MANTRA Chain, a Cosmos-based network focused on tokenized real-world assets, remains offline after an attacker exploited a vulnerability in what the team called an upstream dependency, meaning software the chain uses but does not itself develop. CryptoSlate reports that transactions, transfers, staking and bridge operations are all unavailable and that a restart depends on validators testing a patched release. Exchange partners have suspended deposits and withdrawals for the OM token, which CoinDesk reported fell about 18% to a record low near $0.0041.

MANTRA has not disclosed the amount stolen, the specific dependency, or the final financial impact. A halt on a proof-of-stake chain is a coordination decision made by validators, and it is the clearest available evidence of how concentrated that validator set is. The incident arrives while MANTRA is subject to a pending acquisition by Inveniam Capital Partners, expected to close in the third quarter.

Two smaller incidents were documented in the same period. Security researchers at DeFiHackLabs published a proof-of-concept for a phantom deposit against Allbridge's cross-chain transfer router on Base. The router credited a forged Circle attestation message as a genuine deposit without verifying it, letting the attacker book a fictitious $1 million balance, cover the shortfall with a flash loan and remove the router's entire 191,156 USDC. The root cause was missing verification of an off-chain message the contract was designed to trust.

The same repository carries a proof-of-concept against FlashstakeV2, a protocol that pays yield upfront, where a mispriced reward pool allowed an attacker to claim an instant reward larger than the deposit justified. That is a logic and pricing defect rather than a memory or access-control bug. No loss figure has been confirmed, and neither incident has a public attribution. Rekt News has tracked this pattern throughout the year: bridges and trusted message paths account for a large share of the value lost.