NRDAX-T0407 - Signature Count Integer Overflow Panic

compute_amp · active · first seen 2026-07-17

provenance: Reproduced in NullRabbit's attack-reproduction pipeline

mechanism

Tx::verify_signatures counts/indexes the public keys in a Section::Authorization using a u8-width counter; a single unauthenticated transaction whose Authorization section carries 256+ Ed25519 public keys (with matching valid signatures) overflows that u8 during mempool CheckTx. The overflow triggers a panic, crashing the validating node from one crafted broadcast_tx_sync submission. Fix-class is bounding/validating the authorization key-count (or widening the counter) before/during signature verification, i.e. an integer-overflow-in-untrusted-length-field defect (CWE-190) in mempool tx validation.

instances (1)

chain	primitive	fidelity	origin	reproducer (bundle)	source
namada	namada_multisig_256key_sig_overflow	lab	reverse-engineered-cve	namada_multisig_256key_sig_overflow	-

related (compute_amp)

NRDAX-T0005 - Array Deserialization Memcpy Corruption active NRDAX-T0006 - Async Runtime Blocking VM Execution active NRDAX-T0013 - Bloom Filter Divide-By-Zero Crash active NRDAX-T0076 - Expensive Debug RPC Compute Amplification active NRDAX-T0101 - Handshake Crypto Validation Bypass Crash active NRDAX-T0122 - Integer Signedness Index OOB Crash active NRDAX-T0129 - Invalid Curve Point Panic active NRDAX-T0139 - Legacy Sighash Quadratic CPU Blowup active

cite

https://nrdax.com/techniques/NRDAX-T0407

plain

NRDAX Registry. Technique NRDAX-T0407.

bibtex

@misc{nrdax_NRDAX_T0407,
  title = {Signature Count Integer Overflow Panic (NRDAX-T0407)},
  howpublished = {NRDAX Registry},
  url = {https://nrdax.com/techniques/NRDAX-T0407},
}

json (csl)

{
  "id": "nrdax-NRDAX-T0407",
  "type": "dataset",
  "title": "Signature Count Integer Overflow Panic (NRDAX-T0407)",
  "URL": "https://nrdax.com/techniques/NRDAX-T0407",
  "publisher": "NRDAX Registry"
}

badge

[![NRDAX-T0407 in the NRDAX registry](https://nrdax.com/badge/NRDAX-T0407.svg)](https://nrdax.com/techniques/NRDAX-T0407-signature-count-integer-overflow-panic)

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-T0407

Cite it (BibTeX)

nrdax cite NRDAX-T0407 --format bibtex

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