CVE•Published 2026-02-03•Modified 2026-07-15•0 articles on news•4 live references•NVD data

CVE-2026-25223Fastify · Fastify

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 49% of all CVEs

Weaknesses (CWE)

CWE-436Interpretation Conflict CWE-179Incorrect Behavior Order: Early Validation

Description

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.

Timeline

Published 2026-02-03

Modified 2026-07-15

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-25223

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Fastify Fastify"

All exposed Fastify Fastify instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Fastify"

HTTP body or banner mentions "Fastify" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-25223