CVE•Published 2026-04-15•Modified 2026-07-15•0 articles on news•4 live references•NVD data

CVE-2026-33806Fastify · 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 67% of all CVEs

Weaknesses (CWE)

CWE-1287Improper Validation of Specified Type of Input CWE-1289Improper Validation of Unsafe Equivalence in Input

Description

Impact: Fastify applications using schema.body.content for per-content-type body validation can have validation bypassed entirely by prepending a space to the Content-Type header. The body is still parsed correctly but schema validation is skipped. This is a regression introduced in fastify >= 5.3.2 by the fix for CVE-2025-32442 Patches: Upgrade to fastify v5.8.5 or later. Workarounds: None. Upgrade to the patched version.

Timeline

Published 2026-04-15

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-2026-33806

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-2026-33806