CVE Explorer
CVE-2026-2880
A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)).
When Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","packageURL":"pkg:npm/@fastify/middie","product":"@fastify/middie","vendor":"@fastify/middie","versions":[{"lessThan":"9.2.0","status":"affected","version":"0.0.0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:d1c6ad314da1e69002bd2ae849a0f994d8c29af3bcc6f510041c6410e452a82d · sha256:7fb8e9d742b28231… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact…
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:d1c6ad314da1e69002bd2ae849a0f994d8c29af3bcc6f510041c6410e452a82d · sha256:7fb8e9d742b28231… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-20","description":"CWE-20","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:d1c6ad314da1e69002bd2ae849a0f994d8c29af3bcc6f510041c6410e452a82d · sha256:7fb8e9d742b28231… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"url":"https://github.com/fastify/middie/security/advisories/GHSA-8p85-9qpw-fwgw"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:d1c6ad314da1e69002bd2ae849a0f994d8c29af3bcc6f510041c6410e452a82d · sha256:7fb8e9d742b28231… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.