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NRDAX-T0384 - HTTP/2 Continuation Frame Flood

Compute amplification · RPC and public API · mis-quantified bound · active · first seen 2026-07-13

provenance: Reproduced in NullRabbit's attack-reproduction pipeline

mechanism

The HTTP/2 decoder's header-list-size guard is size-based (maxHeaderListSize - frameSize < currentSize) and never trips when each CONTINUATION frame carries zero bytes, so no count limit exists on CONTINUATION frames following an unterminated HEADERS block (END_HEADERS=0). An attacker opens a header block and streams an unbounded sequence of zero-length CONTINUATION frames on one connection, each costing only a 9-byte frame header to send. The decoder keeps parsing every frame, monopolizing a CPU thread and producing a compute-exhaustion DoS at negligible attacker bandwidth.

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
http2 http2_continuation_flood lab reverse-engineered-cve http2_continuation_flood -

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-T0384

plain

NRDAX Registry. Technique NRDAX-T0384.

bibtex
@misc{nrdax_NRDAX_T0384,
  title = {HTTP/2 Continuation Frame Flood (NRDAX-T0384)},
  howpublished = {NRDAX Registry},
  url = {https://nrdax.com/techniques/NRDAX-T0384},
}
json (csl)
{
  "id": "nrdax-NRDAX-T0384",
  "type": "dataset",
  "title": "HTTP/2 Continuation Frame Flood (NRDAX-T0384)",
  "URL": "https://nrdax.com/techniques/NRDAX-T0384",
  "publisher": "NRDAX Registry"
}
badge

NRDAX-T0384 in the NRDAX registry

[![NRDAX-T0384 in the NRDAX registry](https://nrdax.com/badge/NRDAX-T0384.svg)](https://nrdax.com/techniques/NRDAX-T0384-http-2-continuation-frame-flood)

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-T0384
Cite it (BibTeX) 
nrdax cite NRDAX-T0384 --format bibtex

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