NRDAX-T0330 - Unbounded Signature Verification CPU Exhaustion

Pending classification · active · first seen 2026-07-07

Producer label: rpc_handler_cpu. Not yet assigned a mechanism family.

provenance: Reproduced in NullRabbit's attack-reproduction pipeline

mechanism

Aptos POST /v1/transactions/batch verifies + JSON→native-converts EVERY element before the batch-size cap (default 10) rejects (transactions.rs:525) - cap-after-work. Unauth attacker POSTs N≫cap signed txs; 1 attacker × 4 conns → 391% CPU on a 4-core node, legit p99 +70-100x. NullRabbit measurement; chains/aptos/findings/APT_REST_BATCH_UNCAPPED_VEC.

live exposure

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

instances (1)

chain	primitive	fidelity	origin	reproducer (bundle)	source
aptos	aptos_batch_uncapped_vec_cpu	lab	NullRabbit Labs	aptos_batch_uncapped_vec_cpu	github.com ↗

references

vendor-advisory: GHPR-tronprotocol-java-tron-6820

cite

https://nrdax.com/techniques/NRDAX-T0330

plain

NRDAX Registry. Technique NRDAX-T0330.

bibtex

@misc{nrdax_NRDAX_T0330,
  title = {Unbounded Signature Verification CPU Exhaustion (NRDAX-T0330)},
  howpublished = {NRDAX Registry},
  url = {https://nrdax.com/techniques/NRDAX-T0330},
}

json (csl)

{
  "id": "nrdax-NRDAX-T0330",
  "type": "dataset",
  "title": "Unbounded Signature Verification CPU Exhaustion (NRDAX-T0330)",
  "URL": "https://nrdax.com/techniques/NRDAX-T0330",
  "publisher": "NRDAX Registry"
}

badge

[![NRDAX-T0330 in the NRDAX registry](https://nrdax.com/badge/NRDAX-T0330.svg)](https://nrdax.com/techniques/NRDAX-T0330-unbounded-signature-verification-cpu-exhaustion)

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-T0330

Cite it (BibTeX)

nrdax cite NRDAX-T0330 --format bibtex

CLI guide → GitHub ↗