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Informational 15 Bitcoin

feat(core): increase maximum passphrase length to 128 bytes

TZ835efbb6 View source ↗
Public commit record

What the developer wrote

Authored by Roman Zeyde

87/100 · Strong
feat(core): increase maximum passphrase length to 128 bytes

Legacy & older core models support up to 50 bytes.

Also, use the same test vectors for all core models.
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope✓ Provides an explanatory body✓ Mentions testing or verification
The short version

What changed, and why it matters

This commit simply raises the maximum allowed passphrase length on newer Trezor Core devices from 50 bytes to 128 bytes. It is a feature change, not a security fix or vulnerability. Older and legacy models keep the 50-byte limit. The change is accompanied by updated tests and a new device capability field so software can read the current limit.

Recommended action

No security action required. Treat as a normal feature commit. If reviewing, verify that downstream wallets and documentation correctly interpret the new max_passphrase_len feature field and that legacy devices still enforce 50 bytes.

Security signals we found

No strong security signals were identified.

Risk score

Why this scored 15/100

Our methodology →
Potential impact 0/30
Exploitability 0/25
Stealth signal 0/15
Affected reach 0/15
Confidence 10/10
Evidence quality 5/5
Human-validated context

Community notes

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The AI analysis stands alone for now. Submit a note if you can add evidence or important context.

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