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NRDAX-T0246 - Rate-Limit Key Confusion

Connection exhaustion · RPC and public API · mis-scoped bound · active · first seen 2026-07-09

provenance: Reproduced in NullRabbit's attack-reproduction pipeline

mechanism

IC ingress-pool per-NodeId quota mis-key (IC_N1_INGRESS_POOL_QUOTA_MISKEY): every HTTP-arriving ingress message buckets under the carrier replica's own NodeId instead of the signing principal (call.rs:391), so a single shared per-NodeId quota gates ALL public HTTP ingress. Submitting 10001 small signed HTTP ingress POSTs trips exceeds_limit (measured 0.04s at production caps 10000 / 100 MB); the handler's RemoveFromUnvalidated then purges 100% of legit unvalidated HTTP ingress on that replica at the next on_state_change (~200ms). PUBLIC reach; ~50k signed-ingress/s keeps a replica wiped; ~40 MB total bandwidth pins a 40-replica subnet. NullRabbit measurement; chains/ic/findings/IC_N1_INGRESS_POOL_QUOTA_MISKEY.

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)

chainprimitivefidelityoriginreproducer (bundle)source
ic ic_ingress_pool_quota_miskey lab NullRabbit Labs ic_ingress_pool_quota_miskey github.com ↗

related (Connection exhaustion)

NRDAX-T0041 - Cross-Chain Peer Pool Pollution active NRDAX-T0064 - Endpoint Concurrency Cap Exhaustion active NRDAX-T0099 - Half-Open Handshake Slowloris active NRDAX-T0214 - Protocol Message Flood Unbounded Goroutine active NRDAX-T0225 - QUIC Control Frame Flood active NRDAX-T0261 - RPC Request Flood active NRDAX-T0291 - Subscription Permit Exhaustion active NRDAX-T0320 - Unbounded Connection Flood active

cite

https://nrdax.com/techniques/NRDAX-T0246

plain

NRDAX Registry. Technique NRDAX-T0246.

bibtex
@misc{nrdax_NRDAX_T0246,
  title = {Rate-Limit Key Confusion (NRDAX-T0246)},
  howpublished = {NRDAX Registry},
  url = {https://nrdax.com/techniques/NRDAX-T0246},
}
json (csl)
{
  "id": "nrdax-NRDAX-T0246",
  "type": "dataset",
  "title": "Rate-Limit Key Confusion (NRDAX-T0246)",
  "URL": "https://nrdax.com/techniques/NRDAX-T0246",
  "publisher": "NRDAX Registry"
}
badge

NRDAX-T0246 in the NRDAX registry

[![NRDAX-T0246 in the NRDAX registry](https://nrdax.com/badge/NRDAX-T0246.svg)](https://nrdax.com/techniques/NRDAX-T0246-rate-limit-key-confusion)

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-T0246
Cite it (BibTeX) 
nrdax cite NRDAX-T0246 --format bibtex

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