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Low 43 Bitcoin

fix: approve avantis dex

TZa2fa7703 View source ↗
Public commit record

What the developer wrote

Authored by Ioan Bizău

40/100 · Thin
fix: approve avantis dex
✓ Subject identifies a change✓ Uses a recognizable type or scope! No meaningful explanatory body
The short version

What changed, and why it matters

This update fixes a bug in Trezor hardware wallets when signing certain Ethereum token-approval transactions. Some legitimate DeFi transactions include extra data that the wallet did not expect, which previously caused the device to crash instead of signing. The fix makes the wallet fall back to a simpler, generic signing mode for these unusual transactions. It is a reliability/usability fix rather than a theft-of-funds vulnerability, but a crash could still be used to deny service or trick a user into a less safe workflow.

Recommended action

Apply the firmware update. Users signing DeFi approvals with extra payload data (such as Avantis/ERC-8021) should ensure they are on the patched firmware to avoid device crashes during signing. Review blind-signing warnings carefully when this fallback is triggered.

Security signals we found

01

Crash/DoS in Ethereum transaction parsing for approve() calls with non-standard payload length

02

Fallback to blind signing when structured parsing assumptions fail

03

New regression test for ERC-8021 appended-data approve transactions

Risk score

Why this scored 43/100

Our methodology →
Potential impact 8/30
Exploitability 7/25
Stealth signal 6/15
Affected reach 10/15
Confidence 8/10
Evidence quality 4/5
Human-validated context

Community notes

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