bound preimage writes by the output buffer capacity

F-LEDGER-BTC-PREIMAGE-001

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Recorded evidence

—score not recorded

LedgerHQ/app-bitcoinReported fixLedgerHQ/app-bitcoin

bound preimage writes by the output buffer capacity

fixed in public source; rollout not reverified

details

Finding IDs: F-LEDGER-BTC-PREIMAGE-001
Status: fixed in public source; rollout not reverified
Disclosure date: 27 Mar 2026
Note: call_get_preimage now rejects an oversized preimage and checks buffer writes. The finding-to-patch mapping is based on the reported callsite and public diff, not public attribution of this finding ID. A fixed release and device rollout were not independently checked.

F-LEDGER-BTC-PREIMAGE-001: Memory safety. Preimage writes require an explicit destination-buffer bound. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-LEDGER-BTC-PREIMAGE-001

Security area (1seal assessment): Memory safety. The patch bounds writes to a caller-provided preimage buffer. Reviewed 23 Sep 2026.

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