CVE Explorer

CVE-2026-48713

Versions prior to 2.6.6 are vulnerable to prototype pollution via crafted missing-key strings when used to persist missing translation keys (e.g. via i18next-http-middleware's missingKeyHandler exposed to untrusted input). Backend.writeFile() splits each queued missing-key string on the configured keySeparator (default .) before calling the internal setPath() walker. The walker (getLastOfPath in lib/utils.js) did not guard against unsafe segments, so a key like "__proto__.polluted" was split int

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4b82864e8571b0a1f16267d9c4195af8818b14586ae2b916fdd4c26d3c9b96a2

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"i18next-fs-backend","vendor":"i18next","versions":[{"status":"affected","version":"< 2.6.6"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:1f19c4d9446a1d1ea4cc3b399375ee6feefb5e19565541e63b0fa400a599cdee · sha256:f4a92b987225cedd… · /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:v2:1f19c4d9446a1d1ea4cc3b399375ee6feefb5e19565541e63b0fa400a599cdee · sha256:f4a92b987225cedd… · /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:v2:1f19c4d9446a1d1ea4cc3b399375ee6feefb5e19565541e63b0fa400a599cdee · sha256:f4a92b987225cedd… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/i18next/i18next-fs-backend/commit/3ab0448087da6935a40117f904b7457281f963f4","tags":["x_refsource_MISC"],"url":"https://github.com/i18next/i18next-fs-backend/commit/3ab0448087da6935a40117f904b7457281f963f4"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1f19c4d9446a1d1ea4cc3b399375ee6feefb5e19565541e63b0fa400a599cdee · sha256:f4a92b987225cedd… · /containers/cna/references/1

{"name":"https://github.com/i18next/i18next-fs-backend/security/advisories/GHSA-2933-q333-qg83","tags":["x_refsource_CONFIRM"],"url":"https://github.com/i18next/i18next-fs-backend/security/advisories/GHSA-2933-q333-qg83"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:1f19c4d9446a1d1ea4cc3b399375ee6feefb5e19565541e63b0fa400a599cdee · sha256:f4a92b987225cedd… · /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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