Ledger Incident Explained: How Hardware Complexity Creates Security Risks

On October 9, 2026, Ledger confirmed it is investigating a wave of asset thefts tied to devices sold through CryptoBilis, an authorized reseller in Southeast Asia. Onchain estimates put the damage above $86 million. The attackers didn’t have to break the cryptography or laser a secure element. They simply exploited the components surrounding the secure chip: the display and battery.
 

This incident highlights a fundamental principle of hardware security: the more complex a device is, the more potential attack vectors it introduces. Screens, batteries, communication modules, internal wiring, and additional chips may improve functionality, but they also create more opportunities for attackers to interfere.
 

Another vulnerability exploited in this incident was the seed phrase, which remains one of crypto's biggest security risks. Whether exposed through phishing, social engineering, physical tampering, or compromised devices, a stolen seed phrase can give attackers complete remote control over a user's funds. The cryptography doesn't need to be broken if the recovery phrase itself is compromised.

What happened? 

In August 2025, someone on Reddit posted photos of a Ledger Nano X they had bought secondhand in Thailand. The battery was too small, and a second hand-wired board with its own antenna sat glued next to the legitimate circuit board. The wallet powered on fine and passed Ledger's built-in authenticity check.

Joe Grand, a hardware security researcher, got hold of the device. He spent months pulling it apart: decapsulating the implant's microcontroller, extracting the firmware, and analyzing the radio signals. He published the full teardown at hardwear.io USA 2026 and released the extracted firmware.

Separately, Tibane Labs examined additional specimens and confirmed the implant's capabilities.
 

Fast forward to October 9, 2026. Users across Malaysia, Indonesia, and the Philippines are starting to post on X and Reddit: wallets drained, funds gone. All of them had purchased Ledger devices through CryptoBilis. Blockchain analytics firm Bitquery later put the figure at $92.9 million across 311 wallets on five blockchains.

How the implant worked

The Ledger Nano X keeps private keys inside a certified secure element. On paper, that makes it safe, but the chip has to talk to the screen. When you initialize the wallet, the device displays your 24 recovery words, which travel from the secure element to the OLED display over an SPI bus. More importantly, the data on those wires from the secure element to the display is unencrypted pixel information. This is where the implant eavesdrops to intercept information.
 

Joe Grand's teardown found a board marked V05 glued inside the case shell. Thin enameled copper wires ran from it to the Nano X's SPI test points. On that board: an ARM microcontroller running custom firmware decoded the pixel data in real time, recognized the BIP-39 word list character by character, and stored the full 24-word phrase.
 

The implant had its own communications stack: a modem, an eSIM loaded with a data-only profile, and a hand-wound coil antenna. Once it captured the seed phrase, it sent it over the cellular network to a remote server.
 

Ledger knew this class of attack was possible. Their own Donjon security lab documented the OLED side-channel risk back in 2019 under CVE-2019-14354. The advisory specifically noted that a hardware implant could leverage SPI bus leakage to recover the PIN and recovery phrase. 

Why it matters: complexity creates more attack vectors

The lesson goes beyond Ledger. It raises a fundamental question about hardware wallet security: How many potential attack surfaces does a device really need?

First, complexity creates more attack vectors. Screens, batteries, communication modules, internal wiring, and additional chips may improve functionality, but they also create more opportunities for attackers to interfere. Every additional component expands the potential attack surface.
 

Second, seed phrases remain one of crypto's biggest security risks. Whether exposed through phishing, social engineering, physical tampering, or compromised devices, a stolen seed phrase can give attackers complete control over a user's funds. The cryptography doesn't need to be broken if the recovery phrase itself is compromised.
 

The takeaway is simple: the best way to reduce security risks is to eliminate unnecessary attack vectors.

Tangem takes a fundamentally different approach

Instead of adding more hardware and then trying to secure every additional component, Tangem eliminates unnecessary components. No screen. No battery.  No USB port. Just a secure chip and an NFC antenna. The card draws power from your phone's NFC field. It communicates only through that NFC link, while held against the device, only for the duration of the tap.
 

The same principle applies to seed phrases. By offering a seedless setup, Tangem removes the need to display, write down, or store a recovery phrase that could otherwise be exposed or stolen. Security isn't only about protecting potential vulnerabilities. It's also about designing them out of the product in the first place. This is what Tangem’s architecture comes down to: remove the parts an attacker would need.

Get a Tangem Wallet today
 

How to protect your crypto

Understand what the genuineness check actually checks. Ledger's software verification confirms that the secure element and firmware are authentic. It does not scan the circuit board for extra hardware because software alone cannot catch a physical implant.
 

Think about architecture, not just brand popularity. The implant exploited the wiring between the secure element and the screen. Fewer internal components mean fewer buses to tap, gaps to exploit, and less physical space to hide something.
 

Inspect the device before you use it. Check the packaging for signs of resealing, unusual adhesive, or misaligned labels. Compare the device's weight and dimensions with the manufacturer's published specifications. If the device feels lighter or heavier than expected, do not initialize it. The implant in the Nano X required a smaller battery, which changed the weight distribution.
 

The whole attack came down to a small board glued inside a case, reading what the screen was told to display. This proves that the strongest security feature isn't always the one you add; it's often the attack vector you eliminate by design. 

References

1. Joe Grand — Reverse Engineering a Ledger Nano X Hardware Implant (hardware.io USA 2026) 
2. Tibane Labs — Ledger Nano X: The Spy Implant 
3. The Ledger CryptoBilis hack took $92.9M from 311 wallets. 
4. CVE-2019-14354: OLED side-channel on Ledger Nano S and Nano X · 
5. Ledger investigation confirmed on October 9, 2026