Uncontrolled resource consumption in fastify
Priority LOW 31CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
A denial of service vulnerability exists in Fastify v2.14.1 and v3.0.0-rc.4 that allows a malicious user to trigger resource exhaustion (when the allErrors option is used) with specially crafted schemas.
Why it matters now
EPSS 0.01157 67th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed fastify (npm): 2.15.1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | fastify | Fixed in v2.15.1 and v3.0.0-rc.5. v1 not affected. | — | No fix listed | CNA |
| — | fastify (npm) | before 2.15.1 | 2.15.1 | Patch available | GHSA-xw5p-hw6r-2j98 |
- fastify Vendor— Affected Fixed in v2.15.1 and v3.0.0-rc.5. v1 not affected. Fixed in — No fix listed CNA
- fastify (npm) Vendor— Affected before 2.15.1 Fixed in 2.15.1 Patch available GHSA-xw5p-hw6r-2j98
Remediation
- Fix · GHSA-xw5p-hw6r-2j98 fastify (npm) Fixed in 2.15.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-8192
- 2026-10-03 Alias added: GHSA-xw5p-hw6r-2j98
References
More Fastify vulnerabilities
- TI-2022-18664 Denial of service in Fastify via Content-Type header CVSS 3.1HIGH 7.5
- TI-2025-23513 Fastify vulnerable to invalid content-type parsing, which could lead to validation bypass CVSS 3.1HIGH 7.5
- TI-2026-58050 fastify vulnerable to request validation bypass via skipped boolean false schemas CVSS 3.1HIGH 7.5
- TI-2026-58022 fastify vulnerable to header validation bypass via incomplete schema case normalization CVSS 3.1HIGH 7.5
- TI-2026-53284 fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers CVSS 3.1HIGH 7.5
- TI-2026-26178 fastify vulnerable to Body Schema Validation Bypass via Leading Space in Content-Type Header CVSS 3.1HIGH 7.5
Sources
- CVE-2020-8192 · CVE Program
- CVE-2020-8192 · NVD
- FIRST EPSS
- GHSA-xw5p-hw6r-2j98 · GitHub Advisory Database · CC BY 4.0
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