NRDAX-T0056 - Duplicate Input Validation-Bypass Crash

Fault termination · Consensus ingest · absent invariant · active · first seen 2026-07-08

provenance: Reproduced in NullRabbit's attack-reproduction pipeline

mechanism

CVE-2018-17144: a block whose tx spends one outpoint twice (duplicate inputs); the 0.14 pre-relay optimization (PR#9049) skipped the duplicate-input check → assert(!coin.IsNull()) crash (0.14.x) / supply inflation (0.15.0-0.16.2). Fixed 0.16.3/0.17.0. Patched node rejects bad-txns-inputs-duplicate.

live exposure

No exposure data. Slashr ↗ has no risk signal mapped to this technique yet — absence of data is not absence of exposure.

research

In-depth write-ups of this attack on nullrabbit.ai.

How a missing duplicate-input check in Bitcoin Core let one block crash 0.14.x nodes and silently inflate the supply on 0.15.0-0.16.2 (CVE-2018-17144) ↗

instances (1)

chain	primitive	fidelity	origin	reproducer (bundle)	source
bitcoin	bitcoin_dup_input_crash	lab	reverse-engineered-cve	bitcoin_dup_input_crash	bitcoincore.org ↗

related (Fault termination)

NRDAX-T0001 - Addr Message Counter Overflow Crash active NRDAX-T0005 - Array Deserialization Memcpy Corruption active NRDAX-T0013 - Bloom Filter Divide-By-Zero Crash active NRDAX-T0024 - Compact Block FillBlock Duplicate Crash active NRDAX-T0101 - Handshake Crypto Validation Bypass Crash active NRDAX-T0120 - Integer-Overflow Panic Control Message active NRDAX-T0122 - Integer Signedness Index OOB Crash active NRDAX-T0129 - Invalid Curve Point Panic active

cite

https://nrdax.com/techniques/NRDAX-T0056

plain

NRDAX Registry. Technique NRDAX-T0056.

bibtex

@misc{nrdax_NRDAX_T0056,
  title = {Duplicate Input Validation-Bypass Crash (NRDAX-T0056)},
  howpublished = {NRDAX Registry},
  url = {https://nrdax.com/techniques/NRDAX-T0056},
}

json (csl)

{
  "id": "nrdax-NRDAX-T0056",
  "type": "dataset",
  "title": "Duplicate Input Validation-Bypass Crash (NRDAX-T0056)",
  "URL": "https://nrdax.com/techniques/NRDAX-T0056",
  "publisher": "NRDAX Registry"
}

badge

[![NRDAX-T0056 in the NRDAX registry](https://nrdax.com/badge/NRDAX-T0056.svg)](https://nrdax.com/techniques/NRDAX-T0056-duplicate-input-validation-bypass-crash)

use from the CLI

Retrieve or cite this technique from a script or the terminal with the NRDAX Python library & CLI.

Retrieve this technique

nrdax get NRDAX-T0056

Cite it (BibTeX)

nrdax cite NRDAX-T0056 --format bibtex

CLI guide → GitHub ↗