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CVE-2025-32442

Fastify vulnerability

7.5 HIGHPublic exploitEPSS 0.72%
  1. Published18 Apr 2025

Description

Fastify is a fast and low overhead web framework, for Node.js. In versions 5.0.0 to 5.3.0 as well as version 4.29.0, applications that specify different validation strategies for different content types have a possibility to bypass validation by providing a _slightly altered_ content type such as with different casing or altered whitespacing before `;`. This was patched in v5.3.1, but the initial patch did not cover all problems. This has been fully patched in v5.3.2 and v4.29.1. A workaround involves not specifying individual content types in the schema.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

Fastify4.29.0 · ≥ 5.0.0 < 5.3.2

Remediation

Fixed in
Fastify≥ 5.3.2

References

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Frequently asked

Is CVE-2025-32442 being actively exploited?

CVE-2025-32442 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.72%.

How severe is CVE-2025-32442?

CVE-2025-32442 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2025-32442?

Affected products include Fastify.

How do I fix CVE-2025-32442?

Upgrade affected software to a fixed version, for example Fastify 5.3.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-32442 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.