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NRDAX-T0196 - Path Migration Challenge Queue Exhaustion

Memory amplification · P2P and gossip · no bound · active · first seen 2026-07-10

provenance: Reproduced in NullRabbit's attack-reproduction pipeline

mechanism

quiche QUIC PATH_CHALLENGE unbounded-queue flood (CVE-2023-6193): flood of QUIC 1-RTT short-header packets on one DCID arriving from CHANGING source paths (rotating loopback 4-tuples = QUIC connection migration), each carrying a PATH_CHALLENGE frame (type 0x1a) with fresh 8-byte challenge data. The recipient must echo each as a PATH_RESPONSE (type 0x1b) but, cwnd-restricted, drains slower than challenges arrive, so quiche's pending path-validation queue grows without bound. Real CVE is post-handshake 1-RTT frames; a loopback mock cannot complete a real TLS 1.3 handshake, so the queue-growth wire signature is modelled on the QUIC short-header PATH_CHALLENGE surface (frame type 0x1a + changing source paths on a fixed DCID + ever-fresh challenge data are the load-bearing artefacts). public-cve-replication - replicated wire signature, not a NullRabbit measurement. Affected quiche 0.15.0 through 0.19.0; fixed 0.19.1; CWE-400; CVSS 3.1 5.3 (Moderate). https://github.com/cloudflare/quiche/security/advisories/GHSA-w3vp-jw9m-f9pm

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
quic quiche_path_challenge_queue lab reverse-engineered-cve quiche_path_challenge_queue CVE-2023-6193 ↗

related (Memory amplification)

NRDAX-T0023 - Coalesced Packet Buffer Leak active NRDAX-T0025 - Compact Block Size Integer Overflow active NRDAX-T0038 - Count Underflow Header Serving Amplification active NRDAX-T0042 - Crypto Frame Reassembly Buffer Exhaustion active NRDAX-T0046 - Decompression Bomb Resource Exhaustion active NRDAX-T0059 - Duplicate Transport Parameter Memory Leak active NRDAX-T0061 - Duplicate Tx Mempool Index Desync active NRDAX-T0071 - Ethash Verification Memory Exhaustion active

cite

https://nrdax.com/techniques/NRDAX-T0196

plain

NRDAX Registry. Technique NRDAX-T0196.

bibtex
@misc{nrdax_NRDAX_T0196,
  title = {Path Migration Challenge Queue Exhaustion (NRDAX-T0196)},
  howpublished = {NRDAX Registry},
  url = {https://nrdax.com/techniques/NRDAX-T0196},
}
json (csl)
{
  "id": "nrdax-NRDAX-T0196",
  "type": "dataset",
  "title": "Path Migration Challenge Queue Exhaustion (NRDAX-T0196)",
  "URL": "https://nrdax.com/techniques/NRDAX-T0196",
  "publisher": "NRDAX Registry"
}
badge

NRDAX-T0196 in the NRDAX registry

[![NRDAX-T0196 in the NRDAX registry](https://nrdax.com/badge/NRDAX-T0196.svg)](https://nrdax.com/techniques/NRDAX-T0196-path-migration-challenge-queue-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-T0196
Cite it (BibTeX) 
nrdax cite NRDAX-T0196 --format bibtex

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