CVE-2026-25224: low-severity vulnerability in fastify
Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream
Published · Updated
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8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 3.7epss 0.5%
Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.3, a denial-of-service vulnerability in Fastify’s Web Streams response handling can allow a remote client to exhaust server memory. Applications that return a ReadableStream (or Response with a Web Stream body) via reply.send() are impacted. A slow or non-reading client can trigger unbounded buffering when backpressure is ignored, leading to process crashes or severe degradation. This issue has been patched in version 5.7.3.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
fastify · fastifyRelated CVEs — fastify
In the same product, most dangerous first.
CVE-2022-39288HIGHDenial of service in Fastify via Content-Type headerEPSS 59.2%CVE-2026-25223HIGHFastify's Content-Type header tab character allows body validation bypassEPSS 0.9%CVE-2025-32442HIGHFastify vulnerable to invalid content-type parsing, which could lead to validation bypassEPSS 0.7%CVE-2026-76169HIGHfastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlersEPSS 0.5%CVE-2026-84428HIGHfastify vulnerable to header validation bypass via incomplete schema case normalizationEPSS 0.5%CVE-2026-84469HIGHfastify vulnerable to request validation bypass via skipped boolean false schemasEPSS 0.5%