CVE Explorer

CVE-2026-41690

18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Versions prior to 3.9.3 allow an unauthenticated HTTP client to pollute Object.prototype in the Node.js process hosting the middleware, via two unvalidated entry points that reach internal object-key writes: getResourcesHandler and missingKeyHandler. This can break authorisation checks (if (user.isAdmin) returning true for any user), cause type-confusion DoS, and depending on

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7db7bc16c9f12db3fdf90b7a6e82ab9c2f5317a5f6f9c6636985eb353ba2e46b

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-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:ac53226d76b3a0eaa1748d25cecc96025846b90a4409edb077948fdf65904f14 · sha256:74054b4cc858f795… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:ac53226d76b3a0eaa1748d25cecc96025846b90a4409edb077948fdf65904f14 · sha256:74054b4cc858f795… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion

{"product":"i18next-http-middleware","vendor":"i18next","versions":[{"status":"affected","version":"< 3.9.3"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:ac53226d76b3a0eaa1748d25cecc96025846b90a4409edb077948fdf65904f14 · sha256:74054b4cc858f795… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:ac53226d76b3a0eaa1748d25cecc96025846b90a4409edb077948fdf65904f14 · sha256:74054b4cc858f795… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions

{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:ac53226d76b3a0eaa1748d25cecc96025846b90a4409edb077948fdf65904f14 · sha256:74054b4cc858f795… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:ac53226d76b3a0eaa1748d25cecc96025846b90a4409edb077948fdf65904f14 · sha256:74054b4cc858f795… · /containers/cna/problemTypes/1/descriptions/0

Source references

1 source assertion

{"name":"https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-5fgg-jcpf-8jjw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-5fgg-jcpf-8jjw"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ac53226d76b3a0eaa1748d25cecc96025846b90a4409edb077948fdf65904f14 · sha256:74054b4cc858f795… · /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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