NRDAX-T0254 - Repair Protocol Legacy Request Stall

Compute amplification (also connection exhaustion) · P2P and gossip · no bound · active · first seen 2026-07-09

provenance: Reproduced in NullRabbit's attack-reproduction pipeline

mechanism

Solana repair-protocol orphan DoS (solana-labs/solana v1.1.16, PR #10290): a legacy no-nonce RepairProtocol::Orphan(ContactInfo, slot) request for a slot > UNLOCK_NONCE_SLOT makes the serving node's serve_repair.rs::run_orphan loop through ALL slot metas in the blockstore building responses, 'effectively DOSing repair'. A tiny unauthenticated UDP orphan request over the serve_repair port thus commits the target to blockstore-proportional CPU (small request -> disproportionate server CPU, compute_amp). Fixed by breaking the loop when repair_response_packet returns None. Public release-note security fix, no CVE -> source_class = public-cve-replication.

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
solana	solana_repair_protocol_dos	lab	reverse-engineered-cve	solana_repair_protocol_dos	github.com ↗

related (Compute amplification)

NRDAX-T0006 - Async Runtime Blocking VM Execution active NRDAX-T0076 - Expensive Debug RPC Compute Amplification active NRDAX-T0088 - GetData Request Flood active NRDAX-T0100 - Handshake Crypto CPU Burn active NRDAX-T0139 - Legacy Sighash Quadratic CPU Blowup active NRDAX-T0143 - Malformed Field Gossip Before Validation active NRDAX-T0148 - Malformed KZG Proof Mismatch DoS active NRDAX-T0166 - Move Verifier Fixpoint CPU Exhaustion active

cite

https://nrdax.com/techniques/NRDAX-T0254

plain

NRDAX Registry. Technique NRDAX-T0254.

bibtex

@misc{nrdax_NRDAX_T0254,
  title = {Repair Protocol Legacy Request Stall (NRDAX-T0254)},
  howpublished = {NRDAX Registry},
  url = {https://nrdax.com/techniques/NRDAX-T0254},
}

json (csl)

{
  "id": "nrdax-NRDAX-T0254",
  "type": "dataset",
  "title": "Repair Protocol Legacy Request Stall (NRDAX-T0254)",
  "URL": "https://nrdax.com/techniques/NRDAX-T0254",
  "publisher": "NRDAX Registry"
}

badge

[![NRDAX-T0254 in the NRDAX registry](https://nrdax.com/badge/NRDAX-T0254.svg)](https://nrdax.com/techniques/NRDAX-T0254-repair-protocol-legacy-request-stall)

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-T0254

Cite it (BibTeX)

nrdax cite NRDAX-T0254 --format bibtex

CLI guide → GitHub ↗