CVE-2022-41919Network attack vector

Cross-site request forgery via substring content-type matching

Published Nov 22, 2022 · Updated Apr 23, 2025

CSRF in Fastify 3.0.0 through 3.29.3 and 4.0.0 through 4.10.1 allows remote attackers to issue cross-origin application requests. The content-type parser uses substring matching on the raw header, so a browser-simple media type containing application/json as a parameter is dispatched to the JSON parser. Exploitation requires a victim to load attacker-controlled content while authenticated to an application with a state-changing JSON route that relies on CORS preflight for protection.

CVSS severity8.8
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in Fastify 3.0.0 through 3.29.3 and 4.0.0 through 4.10.1 allows remote attackers to issue cross-origin application requests. The content-type parser uses substring matching on the raw header, so a browser-simple media type containing application/json as a parameter is dispatched to the JSON parser. Exploitation requires a victim to load attacker-controlled content while authenticated to an application with a state-changing JSON route that relies on CORS preflight for protection.

The record

CVE
CVE-2022-41919
Published
Nov 22, 2022
Updated
Apr 23, 2025
Vendor
Fastify
Product
Fastify
Classifications
CWE-352, CAPEC-62, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.0.0, < 3.29.4
  2. Affected versionversion=>= 4.0.0, < 4.10.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fastify · Fastifyversion=>= 3.0.0, < 3.29.4; version=>= 4.0.0, < 4.10.2

Published CVSS scores

4.2GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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