CVE Explorer

CVE-2026-22037

The @fastify/express plugin adds full Express compatibility to Fastify. A security vulnerability exists in @fastify/express prior to version 4.0.3 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., `/%61dmin` instead of `/admin`). While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify router correctly decodes the path and matches the route handler, allowing attackers to access protected endp

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a1ba8dff23bc725db5e6a36d6d69573f2fedd90adfab0378c90dfcdfc4738467

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-288","description":"CWE-288: Authentication Bypass Using an Alternate Path or Channel","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:1111504266a40d3c3ab56039c8065d7fcc8e04dc2164440b554012cc0915d6b5 · sha256:a13d58767c059a8b… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-177","description":"CWE-177: Improper Handling of URL Encoding (Hex Encoding)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:1111504266a40d3c3ab56039c8065d7fcc8e04dc2164440b554012cc0915d6b5 · sha256:a13d58767c059a8b… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion

{"product":"fastify-express","vendor":"fastify","versions":[{"status":"affected","version":"< 4.0.3"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:1111504266a40d3c3ab56039c8065d7fcc8e04dc2164440b554012cc0915d6b5 · sha256:a13d58767c059a8b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:1111504266a40d3c3ab56039c8065d7fcc8e04dc2164440b554012cc0915d6b5 · sha256:a13d58767c059a8b… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions

{"cweId":"CWE-288","description":"CWE-288: Authentication Bypass Using an Alternate Path or Channel","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:1111504266a40d3c3ab56039c8065d7fcc8e04dc2164440b554012cc0915d6b5 · sha256:a13d58767c059a8b… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-177","description":"CWE-177: Improper Handling of URL Encoding (Hex Encoding)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:1111504266a40d3c3ab56039c8065d7fcc8e04dc2164440b554012cc0915d6b5 · sha256:a13d58767c059a8b… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/fastify/fastify-express/commit/dc02a3fe1387f945143f22597baa42557d549a40","tags":["x_refsource_MISC"],"url":"https://github.com/fastify/fastify-express/commit/dc02a3fe1387f945143f22597baa42557d549a40"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1111504266a40d3c3ab56039c8065d7fcc8e04dc2164440b554012cc0915d6b5 · sha256:a13d58767c059a8b… · /containers/cna/references/1

{"name":"https://github.com/fastify/fastify-express/security/advisories/GHSA-g6q3-96cp-5r5m","tags":["x_refsource_CONFIRM"],"url":"https://github.com/fastify/fastify-express/security/advisories/GHSA-g6q3-96cp-5r5m"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1111504266a40d3c3ab56039c8065d7fcc8e04dc2164440b554012cc0915d6b5 · sha256:a13d58767c059a8b… · /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.

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