CVE-2026-63402

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{"bugzilla": {"description": "i18next: i18next: Denial of Service via unsafe recursive object merging", "id": "2564372", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2564372"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-915", "details": ["i18next is an internationalization framework for JavaScript. Prior to version 26.3.4, `deepExtend` in `src/utils.js` checks property existence with the in operator and recurses into inherited built-ins reached through `Object.prototype`. An application must explicitly pass attacker-controlled resource data to `addResourceBundle(lng, ns, data, deep, overwrite)` with both `deep: true` and `overwrite: true`. Source keys such as `hasOwnProperty`, `toString` and `valueOf` can then select shared inherited built-in function objects, and a nested value can overwrite a property of those objects process-wide. For example, making `Object.prototype.hasOwnProperty.call` non-callable causes subsequent uses, including i18next internals, to throw TypeError, resulting in unrecoverable denial of service and limited integrity impact. The `__proto__`/`constructor` guard does not prevent this mechanism because the corruption target is an inherited built-in function rather than the prototype object itself. Default calls without deep merging or with overwrite falsy are unaffected, and no standard i18next backend or integration uses the vulnerable configuration. This issue is distinct from the setPath/key-walking prototype-pollution flaws in i18next-fs-backend (CVE-2026-48713) and i18next-http-middleware (CVE-2026-48714). This issue is fixed in version 26.3.4.", "A flaw was found in i18next. When an application merges translation resources with deep merging and overwriting enabled, the internal merge utility improperly processes inherited built-in functions. A remote attacker can exploit this issue by supplying specially crafted resource data to overwrite properties of shared process objects. This manipulation causes critical runtime operations to fail, resulting in an unrecoverable application crash and a Denial of Service (DoS)."], "name": "CVE-2026-63402", "package_state": [{"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Fix deferred", "package_name": "cryostat/cryostat-openshift-console-plugin-rhel9", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:migration_toolkit_applications:8", "fix_state": "Fix deferred", "package_name": "mta/mta-ui-rhel9", "product_name": "Migration Toolkit for Applications 8"}, {"cpe": "cpe:/a:redhat:migration_toolkit_virtualization:2", "fix_state": "Fix deferred", "package_name": "migration-toolkit-virtualization/mtv-console-plugin-rhel9", "product_name": "Migration Toolkit for Virtualization"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Out of support scope", "package_name": "multicluster-engine/console-mce-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:network_observ_optr:1", 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"Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "grafana", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana12.4", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "grafana13.1", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana13.2", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Fix deferred", "package_name": "jboss-eap.1-runtime-maven-repository.zip", "product_name": "Red Hat JBoss Enterprise Application Platform 8"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Fix deferred", "package_name": "jboss-eap-runtime-maven-repository.zip", "product_name": "Red 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"package_name": "openshift5/nmstate-console-plugin-rhel9", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Fix deferred", "package_name": "openshift5/ose-agent-installer-ui-rhel9", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Fix deferred", "package_name": "openshift5/ose-console-rhel9", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Fix deferred", "package_name": "openshift5/ose-monitoring-plugin-rhel9", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Fix deferred", "package_name": "openshift5/ose-networking-console-plugin-rhel9", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Fix deferred", "package_name": "odf4/ocs-client-console-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Fix deferred", "package_name": "odf4/odf-console-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Fix deferred", "package_name": "odf4/odf-multicluster-console-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Out of support scope", "package_name": "container-native-virtualization/kubevirt-console-plugin-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:secrets_management_console:0", "fix_state": "Out of support scope", "package_name": "external-secrets-management/console-plugin-rhel9", "product_name": "Secrets Management Console for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}], "public_date": "2026-10-30T22:39:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63402\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63402\nhttps://github.com/i18next/i18next/commit/642137b7786d83661ec3ee53027798dc4b81d30a\nhttps://github.com/i18next/i18next/security/advisories/GHSA-6jcc-5g8w-32mx\nhttps://github.com/i18next/i18next/tree/v26.3.4"], "statement": "This vulnerability is rated as Moderate impact because successful exploitation requires specific non-default invocation parameters and direct exposure of translation bundle ingestion to untrusted user input. Standard deployments across Red Hat products bundled with i18next do not expose the required recursive merge and overwrite configuration to end-user input, substantially limiting practical exploitability in default production configurations. Consequently, the blast radius is restricted to instances where custom extensions or applications process untrusted language bundles with both recursive traversal and overwrite options intentionally enabled.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,26.3.4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "i18next", "source": "cna", "vendor": "i18next"}, "product": "i18next", "vendor": "i18next"}], "created": "2026-10-30T23:18:16.569481+00:00", "updated": "2026-11-06T02:30:14.083113+00:00", "vendors": ["i18next", "i18next$PRODUCT$i18next"]}