Vulnerability-Lookup

CVE-2026-25224 (GCVE-0-2026-25224)

Vulnerability from cvelistv5 – Published: 2026-02-03 21:21 – Updated: 2026-02-04 16:20

Title

Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream

Summary

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.

Severity

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-04 16:20 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7761 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/fastify/fastify/security/advis…	x_refsource_CONFIRM
https://github.com/fastify/fastify/commit/eb11156…	x_refsource_MISC
https://hackerone.com/reports/3524779	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
fastify	fastify	Affected: < 5.7.3	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-25224

Vulnerability from fkie_nvd - Published: 2026-02-03 22:16 - Updated: 2026-06-17 10:24

Severity

3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/fastify/fastify/commit/eb11156396f6a5fedaceed0140aed2b7f026be37	Patch
security-advisories@github.com	https://github.com/fastify/fastify/security/advisories/GHSA-mrq3-vjjr-p77c	Vendor Advisory
security-advisories@github.com	https://hackerone.com/reports/3524779	Permissions Required

Impacted products

	Vendor	Product	Version
	fastify	fastify	*

JSON

To clipboard

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GHSA-MRQ3-VJJR-P77C

Vulnerability from github – Published: 2026-02-02 22:25 – Updated: 2026-02-04 17:46

Summary

Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream

Details

Impact

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.

Patches

The issue is fixed in Fastify 5.7.3. Users should upgrade to 5.7.3 or later.

Workarounds

Avoid sending Web Streams from Fastify responses (e.g., ReadableStream or Response bodies). Use Node.js streams (stream.Readable) or buffered payloads instead until the project can upgrade.

References

https://hackerone.com/reports/3524779

Severity

3.7 (Low)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Show details on source website

JSON

To clipboard

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    "severity": "LOW"
  },
  "details": "### Impact\nA Denial of Service vulnerability in Fastify\u2019s 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.\n\n### Patches\nThe issue is fixed in Fastify 5.7.3. Users should upgrade to 5.7.3 or later.\n\n### Workarounds\nAvoid sending Web Streams from Fastify responses (e.g., `ReadableStream` or `Response` bodies). Use Node.js streams (`stream.Readable`) or buffered payloads instead until the project can upgrade.\n\n### References\n- https://hackerone.com/reports/3524779",
  "id": "GHSA-mrq3-vjjr-p77c",
  "modified": "2026-02-04T17:46:06Z",
  "published": "2026-02-02T22:25:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fastify/security/advisories/GHSA-mrq3-vjjr-p77c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25224"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fastify/commit/eb11156396f6a5fedaceed0140aed2b7f026be37"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3524779"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fastify/fastify"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream"
}

Sightings

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Action not permitted

CVE-2026-25224 (GCVE-0-2026-25224)

FKIE_CVE-2026-25224

GHSA-MRQ3-VJJR-P77C

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