CVE Explorer

CVE-2026-48714

i18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. In versions prior to 3.9.7, the missingKeyHandler blocked the literal request-body keys __proto__, constructor, and prototype (added in 3.9.3, see GHSA-5fgg-jcpf-8jjw), but did not reject dotted variants such as "__proto__.polluted". Downstream backends that split the missing-key string on a configured keySeparator (notably i18next-fs-backend ≤ 2.6.5) hand these keys to an un

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:359dcb7fbaadac5eb51ace2218d2ec5613786c7370dff455e881a929bd5f5fbc

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"i18next-http-middleware","vendor":"i18next","versions":[{"status":"affected","version":"< 3.9.7"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:7eb9aacb4254593cbf0a4cfc20ebd8aa2be07e5eed9be95f7be615467869e36c · sha256:60db156a19d6767a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:7eb9aacb4254593cbf0a4cfc20ebd8aa2be07e5eed9be95f7be615467869e36c · sha256:60db156a19d6767a… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"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:v2:7eb9aacb4254593cbf0a4cfc20ebd8aa2be07e5eed9be95f7be615467869e36c · sha256:60db156a19d6767a… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/i18next/i18next-http-middleware/commit/7c6d26f137d3e940b8d229ca148bca38845faf49","tags":["x_refsource_MISC"],"url":"https://github.com/i18next/i18next-http-middleware/commit/7c6d26f137d3e940b8d229ca148bca38845faf49"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:7eb9aacb4254593cbf0a4cfc20ebd8aa2be07e5eed9be95f7be615467869e36c · sha256:60db156a19d6767a… · /containers/cna/references/1

{"name":"https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-f49m-vf83-692w","tags":["x_refsource_CONFIRM"],"url":"https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-f49m-vf83-692w"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:7eb9aacb4254593cbf0a4cfc20ebd8aa2be07e5eed9be95f7be615467869e36c · sha256:60db156a19d6767a… · /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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