ARB
−2.0%Arbitrum pauses new Stylus activations in emergency security upgrade
Image: Crypto BriefingOn October 2 2026, the Arbitrum Security Council executed an emergency upgrade pausing all new Stylus contract activations on Arbitrum One and Nova. Existing active Stylus contracts remain executable and eligible for renewal. The precaution addresses AI-assisted attack risks linked to hand-crafted WebAssembly programs outside the standard Stylus compiler toolchain. A separate guard for BoLD one-step proofs was added to Arbitrum One to hold chain settlement to Ethereum if conflicting proofs are accepted.
Key points
- Existing active Stylus contracts can continue running and be renewed during the pause
- The pause targets AI-assisted attack risks tied to non-standard WebAssembly Stylus programs
- A new BoLD one-step proof guard was added to Arbitrum One as part of the emergency upgrade
Why it matters
The pause temporarily blocks developers from launching new Stylus-based applications on Arbitrum, while existing Stylus products and standard Solidity contracts remain unaffected. The added BoLD guard adds an extra layer of security for Arbitrum One's settlement to Ethereum.
What's unclear
No set timeline for resuming new Stylus activations
Price context · ARB
At publication
$0.2020
Now
$0.2004
Change since
−0.83%
7 days · dashed line = publication
Sources · 3 publishers
Crypto Briefing
Tier 2
Arbitrum pauses new Stylus activations in emergency security action
CryptoSlate
Tier 2
Arbitrum pauses new Stylus activations over AI-assisted attack risks
Coverage timeline
- First reported by The Defiant
- Confirmed by Crypto Briefing
- CryptoVideos brief published
How this brief was made. Our system found this event in 3 independent publications, summarised two complete reports with AI and checked every number above against the source text. Sources are linked in full. Not financial advice. Report an error
RUNE
−7.1%
AAVE
−2.6%
MORPHO
−1.5%
