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Low 35 Bitcoin

support custom path

Public commit record

What the developer wrote

Authored by willwang

28/100 · Opaque
support custom path
✓ Subject identifies a change! No meaningful explanatory body
The short version

What changed, and why it matters

This commit adds support for 'custom derivation paths' in the Keystone 3 hardware wallet firmware. In plain terms, it lets users sign transactions or messages even when the wallet cannot derive the sender's address from its own keys, by making the 'from' address optional in the display and parsing logic. The change touches Ethereum, Solana, and Cardano code, plus UI layout and translations. It is a feature addition rather than a clear security fix, but it changes how the device validates and presents the signing identity, which could affect user trust and transaction safety if not handled carefully.

Recommended action

Treat as a feature commit requiring security review rather than an emergency patch. Verify that: (1) when from=None the device still requires user confirmation of the custom path before signing, (2) the UI warning cannot be bypassed by a malicious host, (3) null from pointers are safely handled in all C consumers, and (4) batch transaction parsing still fails hard on bad keys rather than silently omitting addresses. No immediate CVE or advisory action is warranted from this diff alone.

Security signals we found

01

Optional sender address in transaction/message parsing

02

New UI warning path for custom derivation paths

03

Reduced UI tab count and layout changes

04

Null-pointer handling for missing 'from' in FFI structs

05

No explicit input validation or path-sanitization logic visible in diff

Risk score

Why this scored 35/100

Our methodology →
Potential impact 8/30
Exploitability 6/25
Stealth signal 5/15
Affected reach 7/15
Confidence 6/10
Evidence quality 3/5
Human-validated context

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