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Fastify: DoS via Unbounded Memory Allocation in sendWebStream on Fastify v5.7.0+ leads to OOM crash when backpressure is ignored

🗓️ 26 Jan 2026 11:03:56Reported by onlybugs05Type 
hackerone
 hackerone
🔗 hackerone.com👁 15 Views

Fastify sendWebStream backpressure DoS causes unbounded memory growth and OOM in five seven zero.

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05 Mar 2026 15:49Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.13.7
EPSS0.00488
SSVC
15