Base Ethereum Withdrawals Stalled 36 Hours After Azul TEE Upgrade Bug
Base Ethereum withdrawals were effectively stalled for about 36 hours starting 29 May 2026, after an Azul upgrade bug in the new TEE (Trusted Execution Environment) enclave failed to generate settlement proposals.
According to Base’s official status page, the TEE enclave stopped producing the cryptographic attestations required to post Base’s state commitments to Ethereum mainnet at 15:55 UTC on 29 May. Crucially, block production and user transactions on Base continued normally during the incident, and no funds were reported lost.
Base identified the issue at 15:55 UTC and resolved it at 03:38 UTC on 31 May (roughly a 36-hour window). Most users likely did not notice because Base withdrawals include a mandatory seven-day challenge period, so delays during that interval are less likely to trigger immediate user-facing alerts.
The Azul upgrade went live earlier (around 28 May 18:00 UTC) and introduced an updated proving setup, including the TEE enclave and a dual TEE + zero-knowledge proving approach aimed at shortening the withdrawal challenge window toward six hours. This incident was traced specifically to the TEE enclave component that powers the proof/proposal pipeline.
Base said a post-mortem is pending. The failure is described as the first production incident since Base separated from the Optimism Superchain stack under its independent proving architecture.
Neutral
Neutral—this is a protocol/rollup settlement pipeline incident, not a loss-of-funds event.
Base Ethereum withdrawals were stalled for ~36 hours due to a TEE enclave failure that prevented state commitment proposals reaching Ethereum mainnet. Importantly, block production and user transactions continued, and Base reported no funds lost. Because Base withdrawals already use a mandatory seven-day challenge period, the immediate trader-facing impact was likely limited to operational uncertainty around withdrawal finalization timing.
Short-term, such incidents can create temporary perception risk: L2 users and DeFi protocols may delay actions involving withdrawals or require extra confirmations, which can slightly tighten liquidity and increase short-lived volatility around ETH-related flows. However, since the issue was detected and resolved within the stated window, and no funds were exposed, the market reaction typically remains contained.
Long-term, the credibility impact depends on the forthcoming post-mortem and whether the TEE enclave failure indicates systemic weaknesses in the new independent proving architecture. Similar past L2 outages (when proving/proposal pipelines stall) have tended to produce short bursts of caution followed by normalization once mitigations and reliability improvements are demonstrated.
Overall: expect limited, mostly operational/ETH flow impact, with neutral to mildly cautionary sentiment for Base users rather than a broad bearish signal for ETH or the broader market.