CVE-2026-33011
NestJS Fastify GET middleware bypass via HEAD redirect; middleware skipped.
Is CVE-2026-33011 being exploited?
Not confirmed. CVE-2026-33011 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2026-33011?
CVE-2026-33011 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-33011?
Yes. A fix has been recorded for CVE-2026-33011. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-33011 affect?
CVE-2026-33011 affects NestJS framework <=11.1.15, @nestjs/platform-fastify <= 11.1.15. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-33011?
Upgrade to 11.1.16+ to fix.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
HEAD requests bypass middleware; GET handler runs, possibly skipping auth/validation.
Patch when possible
- affected< 11.1.16
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.