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TI-2022-18664 Aliases CVE-2022-39288GHSA-455w-c45v-86rg

Denial of service in Fastify via Content-Type header

Priority HIGH 73CWE-754Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

fastify is a fast and low overhead web framework, for Node.js. Affected versions of fastify are subject to a denial of service via malicious use of the Content-Type header. An attacker can send an invalid Content-Type header that can cause the application to crash. This issue has been addressed in commit `fbb07e8d` and will be included in release version 4.8.1. Users are advised to upgrade. Users unable to upgrade may manually filter out http content with malicious Content-Type headers.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.59244 99th percentileScored 2026-11-07
Fix Fixed fastify (fastify): 4.8.1fastify (npm): 4.8.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
fastifyfastify4.0.0 to before 4.8.14.8.1Patch availableCNA
—fastify (npm)4.0.0 to before 4.8.14.8.1Patch availableGHSA-455w-c45v-86rg
  • fastify Vendorfastify Affected 4.0.0 to before 4.8.1 Fixed in 4.8.1 Patch available CNA
  • fastify (npm) Vendor— Affected 4.0.0 to before 4.8.1 Fixed in 4.8.1 Patch available GHSA-455w-c45v-86rg

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:fastify:fastify:*:*:*:*:*:node.js:*:*before 4.8.1Vulnerablefastify
  • cpe:2.3:a:fastify:fastify:*:*:*:*:*:node.js:*:* Versions before 4.8.1 Vulnerable ·fastify

Remediation

  • Fix · CNA fastify (fastify) Fixed in 4.8.1
  • Fix · GHSA-455w-c45v-86rg fastify (npm) Fixed in 4.8.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-39288
  2. 2026-10-03 Alias added: GHSA-455w-c45v-86rg

References

Patch 1

Advisory 3

Other 2

  • 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
  • TI-2026-58072 fastify vulnerable to request body replacement via an async validation result collision CVSS 3.1HIGH 8.1
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences