HIGHnpm →
@fastify/express has a middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)
@fastify/express has a middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)
Affected packages
- @fastify/express
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://github.com/fastify/fastify-express/security/advisories/GHSA-6hw5-45gm-fj88
- https://nvd.nist.gov/vuln/detail/CVE-2026-33808
- https://cna.openjsf.org/security-advisories.html
- https://github.com/fastify/fastify-express
Structured record: https://osv.dev/vulnerability/GHSA-6hw5-45gm-fj88
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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