Is CVE-2026-33806 actively exploited?

No active exploitation of CVE-2026-33806 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33806 be exploited remotely?

Yes. CVE-2026-33806 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33806?

CVE-2026-33806 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-33806

HIGH

CVE-2026-33806

CWE-1287Published: April 15, 2026· Updated: Apr 17, 2026

7.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33806 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.