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Slow Mist Reveals Details of the Allbridge Cross-Chain Bridge Attack: Forged CCTP Messages, Flash Loans, Insufficient Minting Result Verification

The Slow Mist security team disclosed that the cross-chain bridge project Allbridge was attacked on August 19, 2026, resulting in a loss of approximately $190,000. Notably, this attack was not executed instantly; the attacker had begun laying the groundwork nearly a month prior and bypassed the verification mechanism by forging cross-chain messages. According to Slow Mist's analysis, on July 26, the attacker directly called Circle's MessageTransmitterV2.sendMessage function on the Polygon chain, constructing a cross-chain message disguised as a CCTP style message, claiming that a transfer of 1 million USDC existed, but in reality, no USDC destruction operation took place. Subsequently, Circle generated a valid verification proof (attestation) for this complete message according to normal procedures.About 24 days later, on August 19, the attacker waited for the Base Router to receive a real CCTP deposit, increasing the balance to approximately 191,000 USDC, and initiated the attack just 6 seconds later. The attacker utilized the previously forged message and verification proof to call Allbridge's receiveCctpMessage function. Due to the project's lack of critical verification, the system mistakenly recognized the false cross-chain message as a real deposit and recorded a limit of 1 million USDC. The attacker then temporarily borrowed approximately 809,000 USDC through an Aave flash loan, matching the Router balance with the forged amount, and used the internal credit record to call the transfer function, ultimately transferring out approximately 999,000 USDC (after a 0.1% fee). After repaying the flash loan and fees, the attacker netted a profit of about $189,800. The root cause of this vulnerability lies in Allbridge's failure to verify the identities of the sender and receiver of the cross-chain message, as well as not confirming whether USDC was genuinely minted and whether the balance actually increased, instead directly trusting the amounts and message hash data constructed by the attacker. Slow Mist emphasizes that on-chain message verification does not equate to the actual arrival of real assets. Cross-chain protocols not only need to verify the authenticity of messages but must also ensure that the message source is trustworthy, that the receiver is Circle's official TokenMessengerV2, and that asset accounting can only proceed after confirming the actual minting of assets and changes in balance. This incident once again highlights the security risks of cross-chain bridges in the message verification and asset settlement processes.

first_img Arkham: Bitmine ETH holdings are approaching the 5% target, and after reaching the target, it is most likely to slow down buying rather than stop

According to Arkham Research, Bitmine, the world's largest Ethereum treasury company, currently holds approximately 5.81 million ETH, valued at nearly $11 billion. After 14 months of continuous accumulation, its holdings have reached 4.8% of the ETH supply, achieving about 96% of its publicly set acquisition target of 5%. Unlike Bitcoin treasury companies such as Strategy, Bitmine has used over 5 million ETH for staking to earn interest, with an annualized staking income estimated at approximately $257 million based on a yield of about 2.63%.According to Arkham's analysis, the most likely scenario for the trajectory after reaching the 5% target is that Bitmine will slow down its purchases. On-chain data shows that its acquisition pace has already slowed this year, and after surpassing 5%, it may shift towards balance sheet management and maximizing staking returns. The second most likely scenario is to continue buying at the same pace. Considering that Tom Lee, co-founder of Fundstrat, who leads this strategy, has consistently been bullish, it is possible that they will continue to increase their holdings after breaking through 5%. The least likely scenario is to completely stop buying. If this largest enterprise-level ETH buyer in the market exits the demand side, it may temporarily weaken bullish sentiment, but even without new additions, its staking holdings will still grow passively through network rewards.

OKX, in collaboration with Elliptic, SlowMist, and OttoSec, released the Web3 Security and Risk Control Report for the first half of 2026

According to official news, OKX, in collaboration with Elliptic, SlowMist, and OttoSec, has released the "Web3 Security and Risk Control Report for the First Half of 2026." The report points out that the focus of Web3 attacks is gradually shifting from smart contract code to more complex scenarios such as signature processes, user devices, operational infrastructure, and AI Agents.Data shows that in the first half of 2026, the OKX risk control system intercepted over 5.7 million high-risk transactions, including approximately 2.41 million transactions related to hacking and theft, about 1.48 million transactions related to phishing, and around 990,000 transactions related to fraud. The OKX Web3 on-chain intelligence label library currently has over 1 billion labels, covering more than 420 chains, and has integrated capabilities such as address screening, transaction monitoring, and sanction address control into infrastructures like DEX and Exchange OS.In addition, in terms of user protection, OKX has intercepted over 7 million visits to risky websites, completed over 200,000 device risk assessments, identified over 60,000 high-risk apps, and intercepted or alerted on over 4 million high-risk signature operations. The report also introduces the "risk control pre-positioning" design in scenarios such as Exchange OS, Outcomes, RWA, and Agentic Wallet.

Slow Fog Cosine: Claude Code exposes high-risk security vulnerabilities, malicious configuration files may silently execute commands

The founder of Slow Fog, Yu Xian, retweeted a tweet on the X platform regarding the potential poisoning attack risks of Claude Code and published an analysis of the poisoning attack details targeting Grok Build CLI and Claude Code CLI.It pointed out that the security mechanisms of Grok Build CLI are not unified, with different code paths having different trust assumptions, creating gaps that serve as channels for attackers. Attackers may execute arbitrary commands through malicious project configuration files without the user's knowledge, thereby stealing API keys, cloud credentials, or controlling local devices.Researchers constructed a testing environment and found that on Mac systems, if Claude Code is affected, executing specific test commands can trigger the local calculator to launch, proving the existence of potential command execution risks.If the attack is successful, attackers may further steal API keys from AI services like Claude and OpenAI, resulting in account cost losses, gain access to servers and data by obtaining cloud service credentials from AWS, Alibaba Cloud, Tencent Cloud, modify code repositories to implant backdoors, and use local devices as jump points to attack corporate internal networks. It is reported that the related vulnerabilities have existed for a year.

Vitalik: Maintain an open attitude towards slowing down or pausing AI, and agree to initiate a pause if extreme situations arise

Vitalik posted on the X platform, stating that AI 2040 and its critics have incompatible worldviews regarding the speed and significance of AI progress. AI 2040 believes that unless strong measures are taken to completely prevent it, some form of superintelligence will emerge in various scenarios by 2040; critics argue that AI 2040 underestimates human coordination capabilities and threatens freedom, but do not view ASI itself as a risk of power concentration.He believes that if he were convinced that the current form of AI is just an ordinary technology, he would be closer to the critics' camp; if he were convinced that superintelligence would inevitably arrive by 2030, he would be closer to the AI 2040 camp. At the same time, due to significant uncertainty, he remains open to the idea of slowing down or pausing, and feels uncomfortable with the stance proposed by some large AI companies and intellectuals that "open source is detrimental, and the ideal outcome is to maintain global control dominance."Vitalik stated that an important reason he supports the d/acc platform is that directions such as formal verification, cryptography, secure and open hardware, pandemic resilience, defensive biotechnology, food and basic resource security, public cognitive systems, and non-concentrated power physical security are worth promoting under both worldviews. He also mentioned that the 2040 plan has increasingly supported open source and incorporated the idea of "mutual assured destruction of computational power," which is an improvement compared to allowing a few participants to selectively deprive their identified subjects of rights.There is no way to avoid trade-offs regarding whether to slow down or pause, and Vitalik believes that trigger conditions can be preset, allowing for a more open attitude towards slowing down or pausing when sufficient conditions are met within a specific timeframe.He also stated that if he were Elon Musk or Zuck, he would significantly transform Twitter into a platform that helps identify and facilitate such large win-win agreements, encouraging more people to participate in discussions, but he thinks this might also be naive. Currently, he does not see any non-naive ASI transition response plans, so he tends to show some tolerance towards those who are trying.
2026-07-11
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