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NRDAX-T0042 - Crypto Frame Reassembly Buffer 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 CRYPTO-frame flood (CVE-2024-1765): flood of QUIC long-header packets each carrying a CRYPTO frame (type 0x06) whose offset escalates by a fixed stride (4096) - leaving the crypto reassembly stream permanently non-contiguous so the receiver retains every out-of-order range - and whose declared length (4096) exceeds the truncated (200-byte) body delivered, so a modest packet rate reserves an unbounded, monotonically-growing crypto-reassembly buffer. Real CVE is post-handshake 1-RTT CRYPTO frames; a loopback mock cannot complete a real TLS 1.3 handshake, so the reassembly-buffer-growth wire signature is modelled on the QUIC long-header CRYPTO surface (frame type + escalating offsets + oversized declared span are the load-bearing artefacts). public-cve-replication - replicated wire signature, not a NullRabbit measurement. Affected quiche <= 0.19.1, 0.20.0; fixed 0.19.2, 0.20.1; CVSS 3.1 5.9 (Moderate); reported by Marten Seemann. https://github.com/cloudflare/quiche/security/advisories/GHSA-78wx-jg4j-5j6g

live exposure

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

instances (2)

chainprimitivefidelityoriginreproducer (bundle)source
quic quiche_crypto_frame_flood lab reverse-engineered-cve quiche_crypto_frame_flood CVE-2024-1765 ↗
quic s2n_quic_crypto_offset_amplification lab reverse-engineered-cve s2n_quic_crypto_offset_amplification CVE-2026-10740 ↗

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-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 NRDAX-T0095 - GraphQL Alias Query Amplification active

cite

https://nrdax.com/techniques/NRDAX-T0042

plain

NRDAX Registry. Technique NRDAX-T0042.

bibtex
@misc{nrdax_NRDAX_T0042,
  title = {Crypto Frame Reassembly Buffer Exhaustion (NRDAX-T0042)},
  howpublished = {NRDAX Registry},
  url = {https://nrdax.com/techniques/NRDAX-T0042},
}
json (csl)
{
  "id": "nrdax-NRDAX-T0042",
  "type": "dataset",
  "title": "Crypto Frame Reassembly Buffer Exhaustion (NRDAX-T0042)",
  "URL": "https://nrdax.com/techniques/NRDAX-T0042",
  "publisher": "NRDAX Registry"
}
badge

NRDAX-T0042 in the NRDAX registry

[![NRDAX-T0042 in the NRDAX registry](https://nrdax.com/badge/NRDAX-T0042.svg)](https://nrdax.com/techniques/NRDAX-T0042-crypto-frame-reassembly-buffer-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-T0042
Cite it (BibTeX) 
nrdax cite NRDAX-T0042 --format bibtex

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