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Moderate 58 Bitcoin

update for new release

Public commit record

What the developer wrote

Authored by Peter D. Gray

28/100 · Opaque
update for new release
✓ Subject identifies a change! No meaningful explanatory body
The short version

What changed, and why it matters

This commit is a release-notes-only update for the COLDCARD hardware wallet firmware. It moves many security-relevant bug fixes and hardening items from the current changelog into the historical release notes for versions 5.6.1 and 1.5.1Q, and adds a new set of notes for versions 5.6.2 and 1.5.2Q. The actual code changes are not present in the diff, only descriptions of them. The described issues include USB data leaks, PSBT tampering, firmware-update bypasses, virtual-disk file parsing flaws, and duress-wallet exposure in Delta Mode. Because we cannot see the patches themselves, we can only assess the claimed severity, not verify the fixes.

Recommended action

Treat this commit as a release-documentation update. Review the actual firmware source commits that implement the listed 5.6.2/1.5.2Q fixes (especially PSRAM virtual-disk parsing, PSBT/firmware overwrite detection, USB ncry v3, and Delta Mode duress handling) to verify the patches match the changelog claims. Users should install the released firmware promptly because the changelog describes multiple security fixes.

Security signals we found

01

USB protocol encryption upgrade (ncry v3) with direction-separated keys and replay protection

02

PSBT tampering detection: re-verify staged bytes before signing after Virtual Disk overwrite

03

Firmware update integrity: abort if staged image overwritten, reject images extending past world-checksum region

04

Virtual Disk / PSRAM file parsing hardening: cyclic FAT chains, inconsistent FAT metadata, integer underflow in psram_copy_file/psram_mmap_file

05

Delta Mode duress-wallet secret exposure mitigation

06

BIP-39 passphrase normalization enforcement (non-ASCII rejection)

07

USB CDC/VCP serial interface removal

08

BIP-322 foreign-input and message-text hardening

09

SIGHASH_SINGLE default blocking (archived to 5.6.1/1.5.1Q)

010

USB dwld arbitrary PSRAM readback fix (archived to 5.6.1/1.5.1Q)

Risk score

Why this scored 58/100

Our methodology →
Potential impact 18/30
Exploitability 12/25
Stealth signal 8/15
Affected reach 10/15
Confidence 7/10
Evidence quality 3/5
Human-validated context

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