Node.js CVE-2026-25223
HIGH
GHSA-jx2c-rxcm-jvmq
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
3Blast Radius
ecosystem impact- 28 npm packages depend on fastify (17 direct, 11 indirect)
Ecosystem-wide dependent count for version 5.7.2.
DescriptionGitHub Advisory
Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.2, a validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character (\t) followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the server still processes the body as the original content type. This issue has been patched in version 5.7.2.
AnalysisAI
Fastify versions before 5.7.2 allow attackers to bypass request body validation by injecting a tab character into the Content-Type header, enabling malicious payloads to reach application logic without validation checks. This remote attack requires no authentication and affects Node.js applications using vulnerable Fastify versions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Fastify versions prior to 5.7.2 with request body validation schemas enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.5 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all applications using Fastify and identify those running versions prior to 5.7.2; assess exposure by determining if affected services process untrusted external input. …
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